The stemplot shows IQ scores that are consistent with the 2018 article "Flynn effect and its reversal are both environmentally caused."88 2 42 488 6 7 7 8 9 9 96 7 7 8 9 9 999 0 0 0 1 2 2 2 40 0 0 1 2 2 2 499 5 5 5 5 5 6 6 7 7 8 8 8 8 8 8 9 9 95 5 5 5 5 6 6 7 7 8 8 8 8 8 8 9 9 91010 0 0 0 0 0 1 1 1 1 1 2 2 3 4 40 0 0 0 0 1 1 1 1 1 2 2 3 4 41010 5 5 5 5 5 6 6 6 7 7 8 8 8 9 95 5 5 5 5 6 6 6 7 7 8 8 8 9 91111 0 2 2 3 30 2 2 3 31111 5 5 6 6 85 5 6 6 81212 2 3 42 3 4This distribution is very close to Normal with a mean of 100 and a standard deviation of 10. Use the Normal distribution with a mean of 100 and standard deviation of 10 as a description of the IQ scores of all adults.Use this distribution and the 68‑95‑99.7 rule to answer the questions. What percentage ?p of all students have IQ scores below 80? Give your answer as a percentage to one decimal place.

Let X denote the IQ scores of adults. Given that X follows N(mean = 100, SD = 10)

Answered: What percentage ?p of all students have…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The stemplot shows IQ scores that are consistent with the 2018 article "Flynn effect and its reversal are both environmentally caused."

88	2 42 4
88	6 7 7 8 9 9 96 7 7 8 9 9 9
99	0 0 0 1 2 2 2 40 0 0 1 2 2 2 4
99	5 5 5 5 5 6 6 7 7 8 8 8 8 8 8 9 9 95 5 5 5 5 6 6 7 7 8 8 8 8 8 8 9 9 9
1010	0 0 0 0 0 1 1 1 1 1 2 2 3 4 40 0 0 0 0 1 1 1 1 1 2 2 3 4 4
1010	5 5 5 5 5 6 6 6 7 7 8 8 8 9 95 5 5 5 5 6 6 6 7 7 8 8 8 9 9
1111	0 2 2 3 30 2 2 3 3
1111	5 5 6 6 85 5 6 6 8
1212	2 3 42 3 4

This distribution is very close to Normal with a mean of 100 and a standard deviation of 10. Use the Normal distribution with a mean of 100 and standard deviation of 10 as a description of the IQ scores of all adults.

Use this distribution and the 68‑95‑99.7 rule to answer the questions.

What percentage ?p of all students have IQ scores below 80? Give your answer as a percentage to one decimal place.

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