22. 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

− 1 0 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 w hether or not the data are normally distributed.