In order to solve this problem we need to know the mean & the terms of the sample.
Statement A :
Gives us 39 consecutive even elements
Eg : 0,2,4,.....To Compute SD
1. Compute the difference of each data point from the mean, and square the result of each
2. compute the average of these values, and take the square root
Which we can calculate easily from the given data
Thus statement A is sufficient
Mean is 382 only gives us the mid point of the set but not the number of elements hence we cannot calculate the SD
Thus statement B is insufficient
Hope this helps
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