If x is normally distributed with mean 12 and standard deviation 2,then P(x  9)is
A)P(z  9/10).
B)P(z   3/2)
C)P(z  2/3)
D)P(z   3/4)

Name: If x is normally distributed with mean 12 and standard deviation 2,then P(x  9)is A)P(z  9/10). B)P(z   3/2) C)P(z  2/3) D)P(z   3/4)
Brand: Quizplus
Rating: 4.7 (30 reviews)

Question

Quizplus · Accepted Answer

To find P(x ≤ 9), we convert x to a standard normal variable z using z = (x - mean) / standard deviation. Here, z = (9 - 12) / 2 = -3/2. Thus, the correct choice is B.

If X Is Normally Distributed with Mean 12 and Standard