Mathematics, 16.11.2020 17:50 hello123485
ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribution that is approximately normal. Find the standard deviation.
Answers: 2
![P(X28)=P(\dfrac{X-\mu}{\sigma}\dfrac{28-20.8}{\sigma})\\\\= P(z\dfrac{7.2}{\sigma})\ \ \ \ [z=\dfrac{X-\mu}{\sigma}]](/tpl/images/0900/9962/79f42.png)
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ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribut...
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