Find the range and coefficient of range of the following data: 25, 67, 48, 53, 18, 39, 44.

Find the range of the following distribution..

Age (in years)	16-18	18-20	20-22	22-24	24-26	26-28
Number of students	0	4	6	8	2	2

The range of a set of data is 13.67 and the largest value is 70.08. Find the smallest value.

Find the range and coefficient of range of the following data. 63, 89, 98, 125, 79, 108, 117, 68

If the range and the smallest value of a set of data are 36.8 and 13.4 respectively, then find the largest value.

Find the standard deviation of first 21 natural numbers.

If the standard deviation of a data is 4.5 and if each value of the data is decreased by 5, then find the new standard deviation.

If the standard deviation of a data is 3.6 and each value of the data is divided by 3, then find the new variance and new standard deviation.

The mean of a data is 25.6 and its coefficient of variation is 18.75. Find the standard deviation.

The following table gives the values of mean and variance of heights and weights of the 10th standard students of a school.

	Height	Weight
Mean	155 cm	46.50 kg
Variance	72.25 cm2	28.09 kg

Which is more varying than the other?