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maw [93]
3 years ago
11

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:

<u>Data</u>

  • 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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