# Question

This frequency distribution represents the data obtained from a sample of word processor repairers. The values are the days between service calls on 80 machines.

Class boundaries Frequency

25.5–28.5 .........5

28.5–31.5 .........9

31.5–34.5 .........32

34.5–37.5 .........20

37.5–40.5 .........12

40.5–43.5 ...........2

Find the variance and standard deviation.

Class boundaries Frequency

25.5–28.5 .........5

28.5–31.5 .........9

31.5–34.5 .........32

34.5–37.5 .........20

37.5–40.5 .........12

40.5–43.5 ...........2

Find the variance and standard deviation.

## Answer to relevant Questions

The average number of days construction workers miss per year is 11. The standard deviation is 2.3. The average number of days factory workers miss per year is 8 with a standard deviation of 1.8. Which class is more variable ...The mean of a distribution is 20 and the standard deviation is 2. Use Chebyshev’s theorem. a. At least what percentage of the values will fall between 10 and 30? b. At least what percentage of the values will fall between ...The average farm in the United States in 2004 contained 443 acres. The standard deviation is 42 acres. Use Chebyshev’s theorem to find the minimum percentage of data values that will fall in the range of 338–548 acres. A measure to determine the skewness of a distribution is called the Pearson coefficient of skewness (PC). The formula is The values of the coefficient usually range from – 3 to + 3. When the distribution is symmetric, the ...Which has a better relative position: a score of 75 on a statistics test with a mean of 60 and a standard deviation of 10 or a score of 36 on an accounting test with a mean of 30 and a variance of 16?Post your question

0