3 Calculate the Standand deviationA 25 vand to hundredths. 16/719

8. Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 210 feet and a standard deviation of 50 feet. Let X = distance in feet for a fly ball. Find the 80th percentile of the distribution of fly balls. (Round your answer to one decimal place.) _____ ft

21. Suppose that the weight of a particular hand weight is advertised to be 5 pounds, but it can actually be as little as 4.7 pounds or as much as 5.1 pounds. What is the standard deviation of the weight? Round your answer to two decimal places.

28)   A coffee machine dispenses coffee into a 12-ounce cup. The amounts of coffee dispensed into the cup are normally distributed with a standard deviation of 0.02 ounce.You can allow the cup to overfill at most 2% of the time. What is the greatest amount should you set as the mean amount of coffee to be dispensed? Round final answer to the third decimal place.

Mean 170 standard deviation 5 we find the heights of 80 people . a) how many would you expect to be between 165 and 175 cm tall? b) how many would you expect to be  taller than 166cm?

16

2, 3, 6, 8, 9 1. find the range 2. Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.) 3.

Which of the following would be an unacceptable level for a Type 2 error in a study?     .80     .20     .10     15%