25. Fifty cities provided information on vacancy rates (in percent)

in local apartments in the following frequency d istribution.

The sample mean and the sample standard deviation are 9%

and 3.6%, respectively.

Vacancy Rate (in percent) Frequency Less than 6 10 6 up to 9 10 9 up to 12 20 12 or more 10 Apply the goodness-of-fit test for normality at the 5%

significance level. Do the sample data suggest that vacancy rates do not follow the normal distribution?