A normal distribution has a mean of 10 and a standard deviation of 1. Find the probability that a randomly selected value is between 8 and 11.

Answer 1

z₈ = (8 - 10) / 1

z₈ = -2

z₁₁ = (11 - 10) / 1

z₁₁ = 1

Locate % for z₁₁ and substract % for z₈