In Exercise 4.5, you were asked to depict
graphically the distribution of the following
sample of statistics exam completion times
61 86 61 58 70 75 66 77 66 64
73 91 65 59 86 82 48 67 55 77
80 58 94 78 62 79 83 54 52 45
Find the mean and the median of this set of
b Using the frequency distribution in Exercise
4.5, determine the mode as the midpoint of
the modal class.
c Locate the mean, the median and the
mode on the relative frequency histogram
constructed in Exercise 4.5.
d Use the shortcut formula to find the variance
of this sample of completion times.
why short cut formula is different？， can you explain this part？
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