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Estimating a Mean: Consider the frequency distribution for 19 test scores (it was a difficult exam)....

Estimating a Mean: Consider the frequency distribution for 19 test scores (it was a difficult exam).

Score   Frequency  
60 − 64 8
65 − 69 4
70 − 74 2
75 − 79 4
80 − 84 1

(a) The class midpoint for the first class is  .

(b) The class midpoint for the second class is  .

(c) Use the frequency table to estimate the mean score. Round your answer to 1 decimal place.

x =

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