# Question: A random sample of data has a mean of 75

A random sample of data has a mean of 75 and a variance of 25.

a. Use Chebyshev's theorem to determine the percent of observations between 65 and 85.

b. If the data are mounded, use the empirical rule to find the approximate percent of observations between 65 and 85.

a. Use Chebyshev's theorem to determine the percent of observations between 65 and 85.

b. If the data are mounded, use the empirical rule to find the approximate percent of observations between 65 and 85.

## Answer to relevant Questions

If the mean of a population is 250 and its standard deviation is 20, approximately what proportion of observations is in the interval between each pair of values? a. 190 and 310 b. 210 and 290 The operations manager at a plant that bottles natural spring water wants to be sure that the filling process for 1-gallon bottles (1 gallon is approximately 3.785 liters) is operating properly. A random sample of 75 bottles ...A manufacturer of portable radios obtained a sample of 50 radios from a week’s output. The radios were checked and the numbers of defects were recorded as follows. Calculate the standard deviation. Following is a random sample of five (x, y) pairs of data points: 112, 2002 130, 6002 115, 2702 124, 5002 114, 2102 a. Compute the covariance. b. Compute the correlation coefficient. A major airport recently hired consultant John Cadariu to study the problem of air traffic delays. He recorded the number of minutes planes were late for a sample of flights in the following table: a. Estimate the mean ...Post your question