Question

A bookstore rents books to students at $2 per book. The cost per hour of running the bookstore is $300. The numbers of books and the probabilities that the bookstore would rent them in an hour mimics the distribution of the outcomes of flipping four coins. The number of books rented was observed to be the same as the number of heads that appear in a four-coin flip. This distribution is represented in the table.

Answer 1

Based on the table, what is the expected value the book store can make in one hour?

$2
$4
$6
$8

Answer 2

It's $4 for future reference.

Answer 3

But there's another question similar to this and the answer choices is different
it's like this:
1
2
3
4
Given the data in the table, what is the expected number of books rented in one hour?

it's not 4

Answer 4

not 3 either

Answer 5

It's 2