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?