Help ASAP the last question below

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.

What is the value of the expression below? (81^2)^1/8

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?