The following are the stopping times (in seconds) of 4r/s vehicles after breaking at 65mph:3,4,5,8. Use an appropriate formula to find the standard deviation of this sample.

In a population with m=60, a score of X=58 corresponds to a z-score of z=-0.50. What is the population standard deviation?

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A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 1544 and the standard deviation was 314.The test scores of four students selected at random are 1940​, 1290​, 2250​,and 1420.Find the​ z-scores that correspond to each value and determine whether any of the values are unusual. ​(Round to 2 decimal places as​ needed.)

The following data are the distances from the workplace (in miles) for the  5 employees of a small business. 14, 3, 8, 13, 2 Assuming that these distances constitute an entire population, find the standard deviation of the population. Round your answer to two decimal places.

An analyst for a transportation metro is asked to examine the time required (x) in minutes for a specific commute route. She records 200 randomly sampled times and finds: Σx = 11,000 and Sxx =1791. Find the average commute time, as well as standard deviation and coefficient of variation.

Assume that the mean height of men in the United States is 70 inches, with a standard deviation of 3 inches.  A particular man is 80 inches tall.  Find the z-score of his height.  (Round to two decimal places.)

A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1458 and the standard deviation was 312. The test scores of four students selected at random are 1860, 1220, 2150, and 1340. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1860 is (Round to two decimal plaes as needed.)

Compute the standard deviation to the nearest 0.01.

A population has mean u = 26 and standard deviation o= 22. Find u, and o- for samples of sizen=100. Round your answers to one decimal place if needed.