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Author Question: A professor at a local community college noted that the grades of his students were normally ... (Read 109 times)

Lin Shi

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on: Mar 25, 2023

Question 1

A manufacturing process produces items whose weights are normally distributed. It is known that 22.57% of all the items produced weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams. Determine the mean and the standard deviation.



Question 2

A professor at a local community college noted that the grades of his students were normally distributed with a mean of 74 and a standard deviation of 10.  The professor has informed us that 6.3 percent of his students received A's while only 2.5 percent of his students failed the course and received F's.


a.

What is the minimum score needed to make an A?

b.

What is the maximum score among those who received an F?

c.

If there were 5 students who did not pass the course, how many students took the course?

Essentials of Statistics for Business and Economics ¦ Anderson, Sweeney, Williams, Camm, Cochran ¦ 7th Edition
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Marked as best answer by Lin Shi on Mar 25, 2023

char00char

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Reply #1 on: Mar 25, 2023
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Lin Shi

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Reply 2 on: Mar 25, 2023
Thanks for the timely response, appreciate it

flexer1n1

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Reply 3 on: Yesterday
Wow, this really help

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