The expected value of a random variable X is 115 and the standard deviation is 21.The standard deviation of the random variable Y = 3X − 10 is
A)63
B)6.48
C)53
D)41

Name: The expected value of a random variable X is 115 and the standard deviation is 21.The standard deviation of the random variable Y = 3X − 10 is A)63 B)6.48 C)53 D)41
Brand: Quizplus
Rating: 4.7 (37 reviews)

Question

Quizplus · Accepted Answer

The standard deviation of Y = 3X - 10 is 3 times the standard deviation of X, which is 3 * 21 = 63.

The Expected Value of a Random Variable X Is 115