Use the binomial theorem to write the binomial expansion of (x+3)4 but the 4 is Square

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.

How do you use the elimination method for this question? explain, because i really want to understand!

Me with this one question, and i'll upvote the brainliest answer