A set of physics exam scores are normally distributed with a mean of 80 points and a standard deviation of 6 points. Irina got a score of 95 points on the exam.
What proportion of exam scores are lower than Irina's score?
You may round your answer to four decimal places.

The proportion of exam scores that are lower than Irina's score is 0.9938

Step-by-step explanation:

Data

z-score is computed as follows:

z = (x - mean)/sd

z = (95 - 80)/6 = 2.5

We want to find:

P(z < 2.5)

From the table attached:

P(z < 2.5) = 0.9938

1

step-by-step explanation:

you are throwing one dart