IQ scores of UIU professors are normally distributed with a mean of 105 and a standard deviation of 21. In a random sample of 90, approximately how many Profs will have IQs between 84 and 133?

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- April 22nd 2008, 11:12 AMSeansgirl1Statistic assistance needed!!!
IQ scores of UIU professors are normally distributed with a mean of 105 and a standard deviation of 21. In a random sample of 90, approximately how many Profs will have IQs between 84 and 133?

- April 22nd 2008, 06:32 PMmr fantastic
This one has been replied to here: http://www.mathhelpforum.com/math-he...ssistance.html

It should be absolutely routine. I don't know what else can be said about it. The answer, correct to four decimal places, is 0.7501.

I don't know how you've been taught to calculate normal probabilities so I can't suggest how you should get that answer.

The volume of questions you're posting will make it difficult, if not impossible, for you to get timely help. You're*swamping*the forum with questions and solutions you want answered and checked. Further, it's difficult to follow a lot of the work you're posting. Replies will probably trickle in over the fullness of time.

I get the feeling many of these are assignment questions that contribute to your course grade - if they are you're skating on thin ice with amount of help your asking ...... I apologise in advance if this is not the case.