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Galina-37 [17]
3 years ago
5

The completion time for an exam is normally distributed with expected value 75 minutes and variance 12 minutes. What is the prob

ability that a student will finish this exam in less than 70 minutes or more than 80 minutes?
Mathematics
1 answer:
Debora [2.8K]3 years ago
5 0

Answer:

14.89% or 0.1489

Step-by-step explanation:

First, find the z-score for both 70 and 80 minutes and their corresponding percentile.

z= \frac{X - \mu }{SD} \\SD=\sqrt{V} =\sqrt{12}\\\mu =75\\z= \frac{X - 75}{\sqrt{12}}\\\\

For X = 70 minutes:

z= \frac{70 - 75}{\sqrt{12}}\\z=-1.4434

This z-score is equivalent to the 7.445 th percentile, so the probability of a student finishing this exam in less than 70 minutes is 7.445%

or X = 80 minutes:

z= \frac{80 - 75}{\sqrt{12}}\\z=1.4434

This z-score is equivalent to the 92.555 th percentile, so the probability of a student finishing this exam in more than 80 minutes is 100- 92.555 = 7.445%

Therefore, the probability (P) of a student finishing this exam in less than 70 minutes or more than 80 minutes is:

P = 7.445% + 7.445% = 14.89%

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