Consider the following five sets of values.

(i) 5  6  7  7  8  9  14

(ii) 3  6  8  9

(iii) 1  1  1  2  5

(iv) 6  8  9  12  15

(v) 50  51  55  60  80  100

(a) Compute the mean of each of the five sets of data. 

(b) Compute the mean of the five means in part (a). 

(c) Find the mean of the 27 pieces of data. 

(d) Compare your answer in part (b) to your answer in part (c). Are the values the same? Does your answer make sense?