lecture(12.4d):  Here are the final grades for the students who took  STAT683 last semester.       84,  72  80  , 77, 78, 81, 64, 86 (a) sum of ( (x)**2)= ? lecture(12.4a):  Here are the final grades for the students who took  STAT683 last semester.       84,  72,  80 , 77, 78, 81, 64, 86 (a) sum of ( (x)**2)= ? (b) (sum of x)**2 =  ? use (a) and (b) to calculate the standard deviation:

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