Books in the library are found to have average length of 350 pages with standard deviation of 100 pages. What is the z-score corresponding to a book of length 80 pages?

A tablet, a yo-yo, and a box of chocolates will be given to 3 randomly picked people out of 25 who attend a pyramid scheme indoctrination session. In how many ways can the 3 people be picked?

The results of a common standardized test used in psychology research is designed so that the population mean is 175 and the standard deviation is 20. A subject earns a score of 227. What is the z-score for this raw score? Do not round your answer.z-score =    ?

Steel rods are manufactured with a mean length of 28 centimeters. because because of variability in the manufacturing process, the lengths of the rods are approximately normally distrubuted with a standard deviation of 0.06. Any rods that are shorter than 27.85 cm or longer than 28.15 cm are discarded. What proportion of rods will be discarded?   Round to 4 decimal places.

If the mean snowfall for Ottawa Ontario Canada is 98 inches per year and the standard deviation is 25 inches what percentage of the time does Ottawa receive less than 125 inches of snow?

A standardized test has a pop. mean of 152 and a standard deviation of 16. What would be the median raw score for this exam?

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Raul received a score of 77 on a history test for which the class mean was 70 with a standard deviation of 9. He received a score of 75 on a biology test for which the class mean was 70 with standard deviation 4.  On which test did he do better relative to the rest of the class

What is the best approximation of the standard deviation ofthe measures -4, -3.0, 8, and 9?

There are eight patients waiting in a doctor's waiting room.  They have been waiting for 9 minutes, 2 minutes, 5 minutes, 4 minutes, 12 minutes, 7 minutes, 8 minutes, and 11 minutes.  Calculate the population standard deviation for the patients' wait times (in minutes). Round to the nearest hundredth as needed.