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Agata [3.3K]
3 years ago
4

ACT scores are normally distributed and from 2015 to 2017, the mean was 20.9 with a standard deviation of 5.6. A perfect score i

s 36. What percentage of the testers scored a perfect score?
Question 4 options:

0.46%


0.35%


99.65%


99.64%
Mathematics
1 answer:
4vir4ik [10]3 years ago
3 0

Answer:

A

Step-by-step explanation:

36 - 20.9 = 15.1

standard deviation = 5.6

15.1/5.6 = 2.696(428571)

So 2.7 times the standard deviation of people have a perfect score.

(which is a little less then 3 times the standard deviation)

This accounts for the population of the top 0.46 %

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