Please help as soon as possible. Urgent.

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.

Solve this problem! extra ! 3025/5.5 = a/90.75

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.