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July 28, 2014

Homework Help: statistics

Posted by Maddie Liguori on Tuesday, March 1, 2011 at 12:27am.

The income of college students is normally distributed with a mean income per year is $12,000 and a standard deviation of $6,000.
a)If we randomly sample 25 college students, what is the probability that the average income of our sample is less than $4,000?
b)If we randomly sample 9 college students, what is the probability that the average income is between $5000 and $20,000?

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