3 years ago

A set of physics exam scores are normally distributed with a mean of 80 points and a standard deviation of 6

Mathematics

1 answer:

Anuta_ua [19.1K]3 years ago

3 0

Answer:

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

Step-by-step explanation:

mean: 80 points

standard deviation (sd): 6 points
value of interest (x): 95 points

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

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