Help pls I don’t know this

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.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

If rt is greater than ba, which statement must be true ?