Given that the mean of a set of data is 40 and the standard deviation is 2, what is the coefficient of variation?

Suppose that the mean weight for men 18 to 24 years old is 170 pounds, and the standard deviation is 20 pounds. In each part, find the value of the standardized score (z-score) for the given weight. USE SALT (a) 206 pounds. Z = (b) 140 pounds. Z = (c) 173 pounds. Z = (d) 236 pounds. Z =

A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What proportion of people scores in the A range (90 or above)?

On a verbal skill test, the mean was 72 and the standard deviation was 7. If John scored 75, what was his z-score?

A quantitative data set has mean 19 and standard deviation 2. Approximately what percentage of the observations lie between 17 and 21​?

If the range of a data set is 64, find the approximate value of the standard deviation, using the range rule of thumb.

Which of the following would be the most reasonable estimate for the weight of house cats?  (The population would be all house cats in the U.S., and the variable would be each cat's weight.) A. Mean = 10 pounds, standard deviation = 0 pounds. B. Mean = 10 pounds, standard deviation = 2 pounds. C. Mean = 10 pounds, standard deviation = 10 pounds. D. Mean = 2 pounds, standard deviation = 10 pounds.

The mean of fifty sales receipts is $65.75 and the standard deviation is $10.55. Using Chebyshev’s theorem, at least 75% of the sales receipts were between $44.65 and $86.85. True or False

According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the standard deviation is 3 inches.  If Zsike is 67 inches tall, what is her z-score?

Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of students scored about 57%. Round two places.