Question

1] mean is 82.5 and standard deviation is 7.2 find coefficient of variance.
2]Find range and coefficient of range for the data: 3, 6, 10, 1, 15, 16, 21, 19, 18.

Answer 1

Hiii.....

Answer .....

1. Mean = 82.5 and S.D = 7.2 ....

Coeff. of Variance = S.D. / Mean × 100 %
= 7.2 / 82.5 × 100 %
= 8.72 %

2. Range = Xmax. - Xmin.
= 21 - 1 = 20 .....

Coeff. of Range= (Xmax. - Xmin.)/Xmax.+ Xmin.

= 21 - 1 / 21 + 1 ...
= 20 / 22 = 10 /11 ...

Hope u got.....