Recent questions tagged medium

Calculate the mean deviation from the median of the following frequency data:

asked Jul 4, 2014 by meena.p

1 answer

Calculate the mean deviation about the mean for the following frequency distribution.

asked Jul 4, 2014 by meena.p

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Mean and standard deviation of 100 items are 50 and 4 , respectively . find the sum of all items and sum of the squares of the items.

asked Jul 4, 2014 by meena.p

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The mean life of a sample of 60 bulbs was 650 hours and the standard deviation was 8 hours. A second sample of 80 bulbs has a mean life of 660 hours and standard deviation 7 hours. Find the overall standard deviation.

asked Jul 4, 2014 by meena.p

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Choose the correct answer from the given four options. The coordinates of the foot of perpendiculars from the point (2, 3) on the line $y = 3x + 4 $ is given by

asked Jul 3, 2014 by thanvigandhi_1

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Choose the correct answer from the given four options. The equations of the lines passing through the point (1, 0) and at a distance $ \large\frac{\sqrt 3 }{2}$ from the origin, are

asked Jul 3, 2014 by thanvigandhi_1

1 answer

Choose the correct answer from the given four options. The equations of the lines which pass through the point (3, –2) and are inclined at $ 60^{\circ}$ to the line $3 x + y = 1$ is

asked Jul 3, 2014 by thanvigandhi_1

1 answer

There are 60 students in a class .The following is the frequency distribution of the marks obtained by the students in a test : where x is a positive integer . Determine the mean and standard deviation of the marks.

asked Jul 3, 2014 by meena.p

1 answer

Choose the correct answer from the given four options. The distance of the point of intersection of the lines 2x – 3y + 5 = 0 and 3x + 4y = 0 from the line 5x – 2y = 0 is

asked Jul 3, 2014 by thanvigandhi_1

1 answer

The frequency distribution given below find the standard deviation

asked Jul 3, 2014 by meena.p

1 answer

Choose the correct answer from the given four options. If the line $ \large\frac{x}{a}$$+ \large\frac{y}{b}$$=1$ passes through the points (2, –3) and (4, –5), then (a, b ) is

asked Jul 3, 2014 by thanvigandhi_1

1 answer

The frequency distribution given below : Where A is a positive integer , has a variance of 160. Determine the value of A.

asked Jul 3, 2014 by meena.p

1 answer

Choose the correct answer from the given four options. The tangent of angle between the lines whose intercepts on the axes are a, – b and b, – a, respectively, is

asked Jul 3, 2014 by thanvigandhi_1

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The mean and standard deviation of some data for the time taken to complete a test are calculated with the following results:Number of observations =$25$,mean =$18.2$ seconds, standard deviation $=3.25$ seconds. Further another set of $15$ observations $x_1,x_2,......x_5$ also in seconds is now available and we have $\sum\limits_{i=1} ^{15}x_i =279$ and $\sum \limits_{i=1} ^{15} x_i^2 =5524$Calculate the standard deviation based on all $40$ observations

asked Jul 3, 2014 by meena.p

1 answer

Choose the correct answer from the given four options. Equations of diagonals of the square formed by the lines x = 0, y = 0, x = 1 and y = 1 are

asked Jul 2, 2014 by thanvigandhi_1

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Choose the correct answer from the given four options.Equation of the line passing through (1, 2) and parallel to the line y = 3x-1 is

asked Jul 2, 2014 by thanvigandhi_1

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Choose the correct answer from the given four options. If the coordinates of the middle point of the portion of a line intercepted between the coordinate axes is (3, 2), then the equation of the line will be

asked Jul 2, 2014 by thanvigandhi_1

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Find the mean deviation about the mean of the distribution

asked Jul 2, 2014 by meena.p

1 answer