Maharashtra Board Solutions for Chapter: Measures of Dispersion, Exercise 4: MISCELLANEOUS EXERCISE - 8

Find the range and mean of the following data.

$116, 124, 164, 150, 149, 114, 195, 128, 138, 203, 144$

Find the range of the following data

Find variance and S.D. for the following set of numbers.

Find the Mean, Variance and Standard Deviation of the given data.

$25, 21, 23, 29, 27, 22, 28, 23, 21, 25$

The arithmetic mean and standard deviation of a series of $20$ items were calculated by a student as$20$ cm and $5$ cm respectively. But while calculating them, an item $13$ was misread as $30$. Find the corrected mean and standard deviation.

The mean and S.D. of a group of $50$ observation are $40$ and $5$ respectively. If two more observations $60$ and $72$ are added to the set, find the mean and S.D. of $52$ items.

The mean height of $200$ students is $65$ inches. The mean heights of boys and girls are $70$ inches and $62$ inches respectively and the standard deviations are $8$and $10$ respectively. Find the number of boys and the combined S.D.

Compute coefficient of variations for the following data to show whether the variation is greater in the yield or in the area of the field.

There are two companies U and V which manufacture cars. A sample of$40$ cars each from these companies are taken and the average running life (in years) is recorded.

Which company shows greater consistency?