Math 7B statistics basics answers:

Question

1: 80 students selected at random during lunch
2:all customers who bought the new coffee
3:no because he didnt choose the students randomly
4:no because not all people who own a cell phone have the same probability of being selected
5:Yes because every student had an equal chance.....

Answer 1

of being selected during lunch.

Answer 2

they are all correct! tyy