Coefficient of Variance#!#Combination of Two Series

The coefficient of variation of two series are 70 and 90 and their standard deviation are 17.5 and 18 respectively.The mean of two series are

Series Combination

Calculate coefficient of variation of the following series:

The equivalent resistance of a series combination of two resistances is X ohm. If the resistance are of 10 ohm and 40 ohm respectively, the value of X will be

Calculate the coefficient of correlation between the two series :

Two metallic rods of length l and 3l have coefficient of linear expansion alpha and 3alpha respectively. The coefficient of linear expansion ofr their series combinations, is

Coefficient of correlation between two variable X and Y is 0.32. Their covariance is 7.86. The variance of X is 10. Find the standard deviation of Y-series.

Slabs In Series Combination

Series and parallel combination