Look at each set of data which data set has a mean absolute deviation of 0.64A. Data set W - 11, 7, 28, 46, 36B. Data set X - 5.7, 7.5, 9.4, 6.4, 8.9C. Data set Y - 10.75, 11.5, 11.9, 10.25, 10.1D. Data set Z - 80, 77, 79, 78, 76

I'll start
Data set A: standard deviation = 14.5
Data set B. standard deviation = 1.41
Data set C = standard deviation = 0.69
Data set D = standard deviation = 1.41
The closest standard deviation to 0.64 is Set C