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Author Question: A continuous random variable x is normally distributed with a mean of 250 and a standard deviation ... (Read 111 times)

nramada

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on: Jun 24, 2018
A continuous random variable x is normally distributed with a mean of 250 and a standard deviation of 50 . Find the z-score for x = 285.

Question 2

Suppose it is known that 60 of students at a particular college are smokers. A sample of 500 students from the college is selected at random. Approximate the probability that at least 280 of these students are smokers.


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amy.lauersdorf90

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Reply #1 on: Jun 24, 2018
Answer to Question 1

0.7

Answer to Question 2

0.9664


nramada

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Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

covalentbond

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Reply 3 on: Yesterday
Wow, this really help

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