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UkoKoshka [18]
3 years ago
9

Helppp!!!

Mathematics
1 answer:
Doss [256]3 years ago
3 0

Answer:

5 people are Barefoot

Step-by-step explanation:

6+4= 10. This is the amount of people who have at least something on their feet

10-3=7. The 3 must be subtracted because it is already included in the people who have something on their feet

12-7+5. Because why not?

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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 distribution that is approximately no
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Answer: 5.37

Step-by-step explanation:

Let x =  ACT scores.

Given: 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.

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Now,

P(X>28)=P(\dfrac{X-\mu}{\sigma}>\dfrac{28-20.8}{\sigma})\\\\= P(z>\dfrac{7.2}{\sigma})\ \ \ \ [z=\dfrac{X-\mu}{\sigma}]    (ii)

One -tailed z value for p-value of 0.09 =1.3408 [By z-table]

From (i) and (ii)

\dfrac{7.2}{\sigma}=1.3408\\\\\Rightarrow\ \sigma=\dfrac{7.2}{1.3408}\\\\\Rightarrow\ \sigma=5.37

Hence, the standard deviation = 5.37

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3 years ago
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