x x*x
data1 79 6241
data2 85 7225
data3 92 8464
data4 87 7569
data5 93 8649
data6 99 9801
sum 535 47949
ave 89.16666667 7991.5
ave^2 7950.694444
std_dev^2 40.80555556 =7991.5-7950.694
std_dev 6.39 =square root of 40.81
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