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Recent questions tagged misc
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IQ of a person is given by the formula $IQ= \large\frac{MA}{CA} $$ \times 100$ Where MA is a mental age and CA is chronological age. If $80 \leq IQ \leq 140$ for a group of 12 years old children find the range of their mental age .
cbse
math
class11
ch6
linear-inequalities
misc
q14
asked
Aug 5, 2014
by
meena.p
1
answer
How many liters of water will have to be added to $1125$ liters of the $45\%$ solution of acid so that the resulting mixture will contain more than $25 \%$ but less than $30\%$ acid content ?
cbse
math
class11
ch6
linear-inequalities
misc
q13
asked
Aug 5, 2014
by
meena.p
1
answer
A solution of $ 8 \%$ basic acid is to be diluted by adding $ 2 \%$ boic acid. Solution to it. The resulting mixture is to be more than $4 \%$ but less than $6 \%$ boric acid. If we have 640 litres of $8^{\circ} \%$ Solution , how many litres of $2 \%$ solution is to be added ?
cbse
math
class11
ch6
linear-inequalities
misc
q12
asked
Aug 5, 2014
by
meena.p
1
answer
A solution is to be kept between $68^{\circ} F$ and $ 77^{\circ} F$ . What is the range in to temperature in degree ceisius (C) if the ceisius (C) if the ceisius / Fahrenheit (F) conversion. formula is given by $F= \large\frac{9}{8} $$c +32?$
cbse
math
class11
ch6
linear-inequalities
misc
q11
asked
Aug 5, 2014
by
meena.p
1
answer
Solve the inequalities and represent the solution graphically on number line. $ 5(2x-7) - 3(2x+3) \leq 0 ; 2x+19 \geq 6x+47 $
cbse
math
class11
ch6
linear-inequalities
misc
q10
asked
Aug 5, 2014
by
meena.p
1
answer
Solve the inequalities and represent the solution graphically on number line. $ 3x-7 > 2(x-6) ; 6-x > 11-2x $
cbse
math
class11
ch6
linear-inequalities
misc
q9
asked
Aug 5, 2014
by
meena.p
1
answer
Solve the inequalities and represent the solution graphically on number line. $ 2(x-1) < x+5 ; 3(x+2) > 2-x $
cbse
math
class11
ch6
linear-inequalities
misc
q8
asked
Aug 4, 2014
by
meena.p
1
answer
Solve the inequality and represent the solution graphically on number line . $5x + 1 > -24; 5x -1 < 24$
cbse
math
class11
ch6
linear-inequalities
misc
q7
asked
Aug 4, 2014
by
meena.p
1
answer
Solve the inequality $7 \;\leq \large\frac{3x+11}{2} $$ \leq 2$
cbse
math
class11
ch6
linear-inequalities
misc
q6
asked
Aug 4, 2014
by
meena.p
1
answer
Solve the inequality $7 \leq \large\frac{(3x+11)}{2} \leq 11$
cbse
math
class11
ch6
linear-inequalities
misc
q6
asked
Aug 1, 2014
by
meena.p
1
answer
Solve the inequality $-12 <4 <- \large\frac{3x}{-5} \leq 2$
cbse
math
class11
ch6
linear-inequalities
misc
q5
asked
Aug 1, 2014
by
meena.p
1
answer
Solve the inequality $-15 < \large\frac{3(x-2)}{5} \leq 0$
cbse
math
class11
ch6
linear-inequalities
misc
q4
asked
Aug 1, 2014
by
meena.p
1
answer
Solve the inequality $-3 \leq 4 - \large\frac{7x}{2} $$ \leq 18$
cbse
math
class11
ch6
linear-inequalities
misc
q3
asked
Aug 1, 2014
by
meena.p
1
answer
Solve the inequality $ 6 \leq -3( 2x-4) < 12$
cbse
math
class11
ch6
linear-inequalities
misc
q2
asked
Aug 1, 2014
by
meena.p
1
answer
Solve the inequality : $ 2 \leq 3x-4 \leq 5$
cbse
math
class11
ch6
linear-inequalities
misc
q1
asked
Aug 1, 2014
by
meena.p
1
answer
An equilateral triangle is inscribed in the parabola $ y^2 = 4 ax$, where one vertex is at the vertex of the parabola. Find the length of the side of the triangle
cbse
class11
ch11
conic-sections
bookproblem
sec-c
medium
misc
p264
q8
asked
Jul 24, 2014
by
thanvigandhi_1
1
answer
A man running a racecourse notes that the sum of the distances from the two flag posts from him is always 10 m and the distance between the flag posts is 8 m. Find the equation of the posts traced by the man.
cbse
class11
ch11
conic-sections
bookproblem
sec-c
medium
misc
p264
q7
asked
Jul 24, 2014
by
thanvigandhi_1
1
answer
Find the area of the triangle formed by the lines joining the vertex of the parabola $ x^2 = 12y $ to the ends of its latus rectum.
cbse
class11
ch11
conic-sections
bookproblem
sec-c
medium
misc
p264
q6
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
A rod of length 12 cm moves with its ends always touching the coordinate axes. Determine the equation of the locus of a point P on the rod, which is 3 cm from the end in contact with the x-axis.
cbse
class11
ch11
conic-sections
bookproblem
sec-c
medium
misc
p264
q5
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
An arch is in the form of a semi-ellipse. It is 8 m wide and 2 m high at the centre. Find the height of the arch at a point 1.5 m from one end.
cbse
class11
ch11
conic-sections
bookproblem
sec-c
difficult
misc
p264
q4
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
The cable of a uniformly loaded suspension bridge hangs in the form of a parabola. The roadway which is horizontal and 100 m long is supported by vertical wires attached to the cable, the longest wire being 30 m and the shortest being 6 m. Find the length of a supporting wire attached to the roadway 18 m from the middle.
cbse
class11
ch11
conic-sections
bookproblem
sec-c
difficult
misc
p264
q3
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
An arch is in the form of a parabola with its axis vertical. The arch is 10 m high and 5 m wide at the base. How wide is it 2 m from the vertex of the parabola?
cbse
class11
ch11
conic-sections
bookproblem
sec-c
difficult
misc
p264
q2
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
If a parabolic reflector is 20 cm in diameter and 5 cm deep, find the focus.
cbse
class11
ch11
conic-sections
bookproblem
sec-b
medium
misc
p264
q1
asked
Jul 23, 2014
by
thanvigandhi_1
1
answer
The hypotenuse of a right angled triangle has its ends at the points (1, 3) and (– 4, 1). Find an equation of the legs (perpendicular sides) of the triangle.
cbse
class11
ch10
bookproblem
straight-lines
misc
sec-b
medium
q17
asked
Jul 11, 2014
by
thanvigandhi_1
1
answer
Prove that \[ 2sin^{-1} \frac{3}{5} = tan^{-1} \frac{24}{7} \]
cl1449
cbse
class12
bookproblem
ch2
misc
q3
p51
medium
sec-b
math
asked
Jul 9, 2014
by
balaji.thirumalai
1
answer
The number lock of a suitcase has four wheels,each labelled with 10 digits (ie) from 0 to 9.The lock opens with a sequence of four digits with no repeats.What is the probability of a person getting the right sequence to open the suitcase?
cbse
math
class11
ch16
probability
bookproblem
misc
q10
sec-b
medium
asked
Jul 7, 2014
by
sreemathi.v
1
answer
If four digit numbers greater than 5000 are randomly formed from the digits 0,1,3,5 and 7,what is the probability of forming number divisible by 5 when repetition of digits is not allowed.
cbse
math
class11
ch16
probability
bookproblem
misc
q9-ii
sec-c
difficult
asked
Jul 3, 2014
by
sreemathi.v
1
answer
If four digit numbers greater than 5000 are randomly formed from the digits 0,1,3,5 and 7,what is the probability of forming number divisible by 5 when the digits are repeated ?
cbse
math
class11
ch16
probability
bookproblem
misc
q9-i
sec-c
difficult
asked
Jul 3, 2014
by
sreemathi.v
1
answer
From the employees of a company ,5 persons are selected to represent them in managing committee of the company.Particulars of five persons are as follows :
cbse
math
class11
ch16
probability
bookproblem
misc
q8
sec-c
difficult
asked
Jul 3, 2014
by
sreemathi.v
1
answer
A and B are two events such that P(A)=0.54,P(B)=0.69 and $P(A\cap B)=0.35$.Find $P(B\cap A')$
cbse
math
class11
ch16
probability
bookproblem
misc
q7-iv
sec-a
easy
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A and B are two events such that P(A)=0.54,P(B)=0.69 and $P(A\cap B)=0.35$.Find $P(A\cap B')$
cbse
math
class11
ch16
probability
bookproblem
misc
q7-iii
sec-a
easy
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A and B are two events such that P(A)=0.54,P(B)=0.69 and $P(A\cap B)=0.35$.Find $P(A'\cup B')$
cbse
math
class11
ch16
probability
bookproblem
misc
q7-ii
sec-a
easy
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A and B are two events such that P(A)=0.54,P(B)=0.69 and $P(A\cap B)=0.35$.Find $P(A\cup B)$
cbse
math
class11
ch16
probability
bookproblem
misc
q7-i
sec-a
easy
asked
Jul 2, 2014
by
sreemathi.v
1
answer
Three letters are dictated to three persons and an envelope is addressed to each of them,the letters are inserted into the envelopes at random so that each envelope contains exactly one letter.Find the probability that at least one letter is in its proper envelope.
cbse
math
class11
ch16
probability
bookproblem
misc
q6
sec-c
difficult
asked
Jul 2, 2014
by
sreemathi.v
1
answer
The mean and standard deviation of a group of 100 observations were found to be 20 and 3, respectively . Later on it was found that three observations were incorrect. Which are recorded by 21,21, and 18 . Find the mean and standard deviation, if the incorrect observations are omitted.
cbse
math
class11
ch15
statistics
misc
q7
sec-b
difficult
asked
Jul 2, 2014
by
meena.p
1
answer
Out of 100 students,two sections of 40 and 60 are formed.If you and your friend are among the 100 students,what is the probability that,you both enter the different sections?
cbse
math
class11
ch16
probability
bookproblem
misc
q5-b
sec-c
difficult
asked
Jul 2, 2014
by
sreemathi.v
1
answer
The mean and standard deviation of marks obtained by 50 students of a class in three subjects , mathematics, physics and chemistry are given below:Which of these three subjects shows the highest variability in marks and shows the lowest?
cbse
math
class11
ch15
statistics
misc
q6
sec-c
medium
asked
Jul 2, 2014
by
meena.p
1
answer
Out of 100 students,two sections of 40 and 60 are formed.If you and your friend are among the 100 students,what is the probability that,you both enter the same section
cbse
math
class11
ch16
probability
bookproblem
misc
q5-a
sec-c
difficult
asked
Jul 2, 2014
by
sreemathi.v
1
answer
In a certain lottery 10,000 tickets are sold and ten equal prizes are awarded.What is the probability of not getting a prize if you buy ten tickets
cbse
math
class11
ch16
probability
bookproblem
misc
q4-iii
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
In a certain lottery 10,000 tickets are sold and ten equal prizes are awarded.What is the probability of not getting a prize if you buy two tickets
cbse
math
class11
ch16
probability
bookproblem
misc
q4-ii
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
In a certain lottery 10,000 tickets are sold and ten equal prizes are awarded.What is the probability of not getting a prize if you buy one ticket
cbse
math
class11
ch16
probability
bookproblem
misc
q4-i
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A die has two faces each with number 1,three faces each with number 2 and one face with number 3.If die is rolled once,determine P(not 3)
cbse
math
class11
ch16
probability
bookproblem
misc
q3-iii
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A die has two faces each with number 1,three faces each with number 2 and one face with number 3.If die is rolled once,determine P(1 or 3)
cbse
math
class11
ch16
probability
bookproblem
misc
q3-ii
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation If it is replaced by 12.
cbse
math
class11
ch15
statistics
misc
q5-ii
sec-c
medium
asked
Jul 2, 2014
by
meena.p
1
answer
A die has two faces each with number 1,three faces each with number 2 and one face with number 3.If die is rolled once,determine P(2)
cbse
math
class11
ch16
probability
bookproblem
misc
q3-i
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
4 cards are drawn from a well shuffled deck of 52 cards.What is the probability of obtaining 3 diamonds and one spade?
cbse
math
class11
ch16
probability
bookproblem
misc
q2
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation If wrong item is omitted.
cbse
math
class11
ch15
statistics
misc
q5-i
sec-c
medium
asked
Jul 2, 2014
by
meena.p
1
answer
A box contain 10 red marbles,20 blue marbles and 30 green marbles.5 marbles are drawn from the box.What is the probability that atleast one will be green?
cbse
math
class11
ch16
probability
bookproblem
misc
q1-ii
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
A box contain 10 red marbles,20 blue marbles and 30 green marbles.5 marbles are drawn from the box.What is the probability that all will be blue?
cbse
math
class11
ch16
probability
bookproblem
misc
q1-i
sec-b
medium
asked
Jul 2, 2014
by
sreemathi.v
1
answer
Given $\bar{x} $ is the mean and $\sigma^2$ is the variance of n observations $x_1,x_2,x_3......x_n$ prove that the mean and variance of the observations $ax_1,ax_2,ax_3.......ax_n$ are $a \bar{x}$ and $a^2\sigma^2$, respectively , $(a\neq 0)$
cbse
math
class11
ch15
statistics
misc
q4
sec-a
difficult
asked
Jul 2, 2014
by
meena.p
1
answer
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