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Nitella [24]
4 years ago
7

A study was done to determine the stress levels that students have while taking exams. The stress level was found to be normally

distributed with a mean stress level of 8.2 and a standard deviation of 1.34. What is the probability that at your next exam, you will have a stress level between 9 and 10?
Mathematics
1 answer:
Advocard [28]4 years ago
3 0

Answer: 0.1841

Step-by-step explanation:

Given: Mean : \mu=8.2

Standard deviation : \sigma = 1.34

The formula to calculate z-score is given by :_

z=\dfrac{x-\mu}{\sigma}

For x= 9, we have

z=\dfrac{9-8.2}{1.34}\approx0.60

For x= 10, we have

z=\dfrac{10-8.2}{1.34}\approx1.34

The P-value = P(0.6

=0.9098773-0.7257469=0.1841304\approx0.1841

Hence, the probability that at your next exam, you will have a stress level between 9 and 10 = 0.1841

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Answer:

(b), (d) and (e)

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See attachment for y = p(t)

Required

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