Iq scores of adults are normally distributed with a mean of

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IQ scores of adults are normally distributed with a mean of 100 and a standard deviation of 15. If one adult is randomly selected, find the probability that their IQ is between 85 and 122?

answer: 0.7705 how?

IQ scores of adults are normally distributed with a mean of 100 and a standard deviation of 15. If one adult is randomly selected, find the probability that their IQ is between 100 and 105?

answer: 0.1293 how?

The mean on a test is a 75 with a standard deviation of 8. The professor is only giving an A to students who scored in the top 8% of the test. What score must a student earn to get an A? Round your answer to the nearest whole number.

answer 86 how?

Wait times at your doctor's office are normally distributed with a mean of 20 minutes and a standard deviation of 10 minutes. Find the probability that a randomly selected patient will have a wait time between 10 and 30 minutes.

0.6826 as answer how?

Reference no: EM13614522

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