Jo is a hairstylist.The probability model below describes the number of clients that she may see in a day.
What is the expected value of the number of clients that Jo sees per day?
A)2.7
B)3.00
C)2.9
D)2.80
E)2.50

Question

Jo is a hairstylist.The probability model below describes the number of clients that she may see in a day. 
What is the expected value of the number of clients that Jo sees per day?
A)2.7 
B)3.00 
C)2.9 
D)2.80 
E)2.50

Quizplus · Accepted Answer

To find the expected value, we multiply each possible number of clients she may see by its corresponding probability, and then take the sum of all these products. 
Expected value = (0.1 * 0) + (0.3 * 1) + (0.4 * 2) + (0.2 * 3) + (0.1 * 4) = 0 + 0.3 + 0.8 + 0.6 + 0.4 = 2.80. So the expected value of clients that Jo sees per day is 2.80. The answer is D.

Jo Is a Hairstylist