Suppose the scores on an exam are normally distributed with a mean μ = 75 points, and standard deviation o = 8 points. Suppose that the top 4% of the exams will be given an A+. In order to be given an A+, an exam must earn at least what score? Report your answer in whole numbers.

Round each z-score to the nearest hundredth. A data set has a mean of  x = 214  and a standard deviation of 44. Find the z-score for each of the following. (a) x = 200   (b) x = 224   (c) x = 300   (d) x = 100

The mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?

A distribution of values is normal with a mean of 137.5 and a standard deviation of 37.8. Find P57, which is the score separating the bottom 57% from the top 43%. P57= Enter your answer as a number accurate to 4 decimal places.

The distribution of scores for an exam follow the rule of thumb for standard deviation. If the average score on the exam is 75 and the standard deviation is 5, what percentage of students would you expect to score between 65 and 85 on the exam (to 2 significant digits)?

The scores on a standardized test normally distributed with a mean of 110 and standard deviation of 25. What score is 2.2 standard deviations above the mean?