Question

The scores on the exam public health professionals take to be certified follows a normal distribution with a mean score of 75 points and a standard deviation of 7 points.

What is the probability someone scores 71.5 or more on the exam?

Answer 1

Solution :

Given that ,

mean = = 75

standard deviation = = 7

P(x 71.5) = 1 - P(x   71.5)

= 1 - P[(x - ) / (71.5 - 75) / 7]

= 1 -  P(z -0.5)   

= 1 - 0.3085

= 0.6915

Probability = 0.6915