Question

Consider a disk and spinner with four equal sectors marked with the numerals 1, 2, 3, and 4.

What is the expected value for a single spin?

If the spinner is spun three times, what is the expected value for the sum of the three numbers spun?

Answer 1

expected value = 1/4(1) + 1/4(2) + 1/4(3) + 1/4(4) = 5/2 or 2.5

So for 3 spins wouldn't it be 7.5 ?

Answer 2

You win $4 if you flip a coin twice and get tails both times. For any other outcome you get nothing. What is the expected value?

Answer 3

it wouldn't be because if you do the math it is really close.