A normal population has mean 7 and standard deviation 7. What is the probability that a randomly chosen value will be greater than 4?

Answer 1

P(X > 4)

standardize to z score

P(Z > (4 - 7)/7)

P(Z > -0.42857)

1 - P(Z < -0.42857)

1 - 0.3341 = 0.6659