# Question: If the mean of a population is 250 and its

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

a. 190 and 310

b. 210 and 290

## Answer to relevant Questions

A set of data is mounded, with a mean of 450 and a variance of 625. Approximately what proportion of the observations is? a. Greater than 425? b. Less than 500? c. Greater than 525? In Chapter 1 we described graphically, with a frequency distribution and histogram, the time (in seconds) for a random sample of n = 110 employees to complete a particular task. Describe the data in Table 1.6 numerically. ...Ten economists were asked to predict the percentage growth in the Consumer Price Index over the next year. Their forecasts were as follows: 3.6 3.1 3.9 3.7 3.5 3.7 3.4 3.0 3.7 3.4 a. Compute the sample mean. b. Compute the ...Following is a random sample of price per piece of plywood, X, and quantity sold, Y (in thousands): Price per Piece (x) Thousands of Pieces Sold (y) $6 ............... 80 7 ............... 60 8 ...Snappy Lawn Care, a growing business in central Florida, keeps records of charges for its professional lawn care services. A random sample of n = 50 charges is stored in the data file Snappy Lawn Care. Describe the data ...Post your question