The standard deviations of two sets containing 10 and 20 members are 2 and 3 respectively measured from their common mean is 5. The standard deviation for the whole set of 30 members is

The standard deviations of two sets containing 10 and 20 members are 2 and 3 respectively measured from their common mean 5. The S.D for whole set of 30 members is

The mean and standard deviation for a,b and 2 are 3 and 1 respectively,then value of ab is

The mean and standard deviation of a set of values are 5 and 2 respectively. If 5 is added to each value, then what is the coefficient of variation for the bew set of values?

The mean and standard deviation of six observations are 8 and 4, respectively.If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.

The mean and standard deviation of 6 observations are 8 and 4 respectively . If each observation is multiplied by 2, find the new mean and new standard deviation of the resulting observation.

Calculate mean and standard deviation from the following data:

The variance of a set of data is 196. Then the standard deviation of the data is.

The variance of a set of data is 169. Then the standard deviation of the data is :