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Question : The following frequency distribution has a sample


The following frequency distribution has a sample mean of −3.5 and a sample standard deviation of 9.7.

Class ………………………………………………………………………………………… Frequency
Less than –10 ………………………………………………………………………………………... 70
–10 up to 0 ……………………………………………………………………………………………. 40
0 up to 10 ……………………………………………………………………………………………... 80
10 or more ……………………………………………………………………………………………. 10

At the 1% significance level, use the goodness-of-fit test for normality to determine whether or not the data are normally distributed.