Question

The probability a certain spinner will land on 1 is 15%, 2 - 20%, 3 - 30%, 4 - 35%/ What is the expected value (mean) the spinner will land on?

A. 2.15
B. 2,5
C. 2,75
D. 2.85

Answer 1

C. 2.75.
The expected value is calculated by multiplying each possible outcome with its probability and then summing the values. The possible outcomes are 1 (15%), 2 (20%), 3 (30%), and 4 (35%). Thus, the expected value is 0.15*1 + 0.2*2 + 0.3*3 + 0.35*4 = 2.75.