Statistics for Business and Economics
Statistics for Business and Economics
8th Edition
ISBN: 9780132745659
Author: Paul Newbold, William Carlson, Betty Thorne
Publisher: PEARSON
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Chapter 2.2, Problem 19E

a)

To determine

The proportion of observations which is greater than 425.

b)

To determine

The proportion of observations which is less than 500.

c)

To determine

The proportion of observations which is greater than 525.

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SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.)   Age (years) Frequency 10 up to 20   3   20 up to 30   7   30 up to 40   18   40 up to 50   20   50 up to 60   12
1. A random sample of data has a mean of 65 and a variance of 25.a. Use Chebyshev’s theorem to determine the percentage of observations between55 and 75.b. If the data are mounded, use the empirical rule to find the approximate percentof observations between 55 and 75.
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