I cannot seem to find this or the sample variance. I have been stuck on these two questions all week. Any help to offer?

Employees in a large company are entitled to 15-minute coffee breaks. A random sample of the duration of coffee breaks for 10 employees was taken with the times shown below. Assuming that the times are normally distributed, is there enough evidence at the 1% significance level to indicate that on average employees are taking longer coffee breaks than they are entitled to? Data Collected X 14 16 16 18 10 16 The alpha error =