3) The data in the project determined that 69.7% of NZ high school students used TikTok. The

number of students who use TikTok in a random sample of 40 students is a binomial random

variable. Explain what it means, in this context, to have a binomial distribution.

4) What is the probability that at most 21 students use TikTok in a random sample of 40

students who participated in the study,

5) Is it unusual to find at most 21 students? Explain.