The standard deviation for the scores 1,2,3,4,5,6 and 7 is 2. Then, the standard deviation of 13,24,35,46,57,68 and 79 is
2
4
22
11
44
Explanation for the correct option
Let x=1,2,3,4,5,6,7and y=13,24,35,46,57,68,79
yi=11xi+2(for i=1,2,....7)
∴Standard Deviation of yi=11×Standard Deviation of xi
∴Standard Deviation of yi=11×2=22
Hence the correct option is option (c).