A normal distribution has μ = 20 and σ = 4.What is the probability of randomly selecting a score greater than 25 from this distribution?
A)0.3944
B)0.1056
C)0.8944
D)0.7888

Question

Quizplus · Accepted Answer

We can standardize the score by using the formula z = (x - μ) / σ where x is the score we're interested in. 
z = (25 - 20) / 4 = 1.25
Using a standard normal distribution table or a calculator, we can find the probability of a z-score greater than 1.25 to be approximately 0.1056.

A Normal Distribution Has μ = 20 and σ =