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# B bob got a 25 on the exam c bobs score is 25

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b. Bob got a 25 on the exam. c. Bob’s score is 25 percentage points above the mean. d. Bob’s score is 0.25 standard deviations above the mean. 4. Total scores on the GMAT (graduate management admission council’s examination) have an approximate Normal distribution with mean 527 points and standard deviation 112 points. How high of a GMAT score is needed to be in the highest 10%? 1. Find X such that the percentage > X is 0.10 2. Find Z such that the percentage > Z is 0.10. For the table, find Z such that the percentage < Z is 0.90. Z = 1.28 3. X = 527 + 1.28(112) = 670.36 or 670. 5. The 90 th percentile of the Z distribution is Z = 0.90. a. True b. False 6. Below is a normal probability plot of salaries for stat 133 students 5 years after they graduate from OSU. Does this data have a Normal distribution? Explain why or why not. No; data does not fall in a straight line. What you observe is not what you expect according to a normal distribution. 2

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The owner of a fish market determined that the average weight for a catfish is 3.6 pounds with a standard deviation of 0.8 pound. Assume catfish weights are normally distributed. 7. What is the probability that a randomly selected catfish will weigh more than 4.8 pounds? a. .9332
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b Bob got a 25 on the exam c Bobs score is 25 percentage...

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