Consider the average daily yields of coke from coal in a coke oven plant summarized by the grouped frequency distribution shown below.
Lower Bound
Upper Bound
Class Midpoint
Frequency
67.95
68.95
68.45
1
69.95
69.45
8
70.95
70.45
22
71.95
71.45
72.95
72.45
9
73.95
73.45
74.95
74.45
2
The estimated mean and standard deviation from the data are 71.25 and 1.2775, respectively. Is the frequency distribution given above significantly different from a normal distribution at the 5% level of significance?
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