Question

Assume that the random variable X is normally distributed, with mean μ = 60 and standard

deviation = 12. Compute the probability P(X < 75).
A) 0.1056
B) 0.9015
C) 0.8944
D) 0.8849

Answer 1

Answer: the correct answer is C) 0.8944.

Explanation:

Z = (X - μ) / σ

Z = (75 - 60) / 12 = 1.25

less than 1.25

P(Z < 1.25) = 0.8944