if the standard deviation of 7,10,13,16,.....,121 is sigma then the standard deviation of 50,71,92,113,....,848 is

Hi Vanipriyanka,
7, 10, 13, 16, ......, 121
The above observations are in A.P and their standard derviation is sigma.
50, 71, 92, 113, ......, 848
These observations are obtained by multiplying 7 and adding 1 to the above observations.
Therefore, standard deviation = 7*sigma
Hope this helps!