The standard deviation of a set of 50 items is 8. Find the standard deviation, if each item is multiplied by 2.

The standard deviation of a set of 30 items is 9.5 Find the standard deviation if every items is decreased by 5.

Find the standard deviation for the data :

Find the standard Deviation of 6 and 8.

The standard deviationof a variable x is 10.Then the standard deviation of 50+5x is :

Find the variance and standard deviation of :

If the first sample A of 100 items has the mean 15 and standard deviation 3 and second sample B has 150 items. If the combined mean and standard deviation of itmes of both the sample is 15.6 and sqrt(13.44) then then standard deviation of items of sample B is

The standard deviation of 15 items is 6 and each item is decreased by 1. Then find the standard deviation of new data.

The standard deviation of 15 items is 6 and each item is decreased by 1. Then find the standard deviation of new data.