If f^-1 is the inverse of f(x), which statements must be true?

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.

Answer this question! 30 points and brainliest! only if you know the answer.

Equation for the calculation double 2 and then add 5