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Recent questions tagged measures-of-dispersion-(mean)
Questions
If the mean of $n$ observation $ 1^2, 2^2, 3^2.....n^2$ is $ \large\frac{46n}{11}$ then $n$ is equal to
jeemain
math
cbse
class11
statistics
measures-of-dispersion-(mean)
difficult
q34
asked
Jan 30, 2014
by
thanvigandhi_1
1
answer
If the mean deviation of the numbers $ 1, 1+d, 1+2d......1+100d$ from their mean is $255$, then the $d$ is equal to
jeemain
math
cbse
class11
statistics
measures-of-dispersion-(mean)
difficult
q31
asked
Jan 29, 2014
by
thanvigandhi_1
1
answer
Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q77
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
A group of 10 items has arithmatic mean 6. If the arithmatic mean of 4 of these remaining item is 7.5 then the mean of the remaining item is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q74
asked
Jan 27, 2014
by
thanvigandhi_1
1
answer
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q71
asked
Jan 26, 2014
by
thanvigandhi_1
1
answer
The mean age of a combined group of men and women is 30 years. If the mean of the age of men and women are respectively 32 and 27, then the percentage of women in the group is
jeemain
math
cbse
class11
statistics
difficult
measures-of-dispersion-(mean)
q28
asked
Jan 26, 2014
by
thanvigandhi_1
1
answer
A group of 10 items has mean 6. If mean of 4 of these items is 7.5 the mean of remaining items is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q68
asked
Jan 26, 2014
by
thanvigandhi_1
1
answer
The mean of a set of observation is $ \overline x$. If each observation is divided by $ a, a \neq 0$ and then is increased by 10, then mean of the new set is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q67
asked
Jan 26, 2014
by
thanvigandhi_1
1
answer
Mean of 100 items is 49. It was discovered that 3 items 60, 70, 80 were wrongly read as 38,22,50 respectively. The correct mean is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q61
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
A car owner buys petrol at Rs. 7.50 Rs. 8.00 and Rs. 8.50 per litre for the 3 successive years. If he spends Rs. 4000 each year, then the average cost per litre of petrol is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q60
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
The weighted mean of first $n$ natural numbers whose weights are equal to the squares of the corresponding numbers is
jeemain
math
cbse
class11
statistics
medium
measures-of-dispersion-(mean)
q32
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
If the mean of the set of numbers $ x_1, x_2.....x_n$ is $ \overline x$ then mean of the numbers $ x_i+2i \: \: 1 \leq i \leq n $ is
jeemain
math
cbse
class11
statistics
medium
measures-of-dispersion-(mean)
q31
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
The average salary of male employees in a factory was Rs. 520 and that of females was Rs. 420. If mean salary of all employees is Rs. 500, the % of male employees is?
jeemain
math
cbse
class11
statistics
difficult
measures-of-dispersion-(mean)
q26
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
Mean of 10 items was found to be 15. On verification it was found that an item 21 was miscopied as 12. Find the correct mean.
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q53
asked
Jan 25, 2014
by
thanvigandhi_1
1
answer
Find the mean of first $n$ odd natural numbers.
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q51
asked
Jan 24, 2014
by
thanvigandhi_1
1
answer
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