# Question

For 50 airplanes that arrived late at an airport during a week, the time by which they were late was observed. In the following table, x denotes the time (in minutes) by which an airplane was late, and f denotes the number of airplanes.

x f

0 to less than 20......... 1 4

20 to less than 40......... 18

40 to less than 60......... 9

60 to less than 80......... 5

80 to less than 10......... 0 4

Find the mean, variance, and standard deviation.

x f

0 to less than 20......... 1 4

20 to less than 40......... 18

40 to less than 60......... 9

60 to less than 80......... 5

80 to less than 10......... 0 4

Find the mean, variance, and standard deviation.

## Answer to relevant Questions

Explain the relationships among the mean, median, and mode for symmetric and skewed histograms. Illustrate these relationships with graphs. A sample of 2000 observations has a mean of 74 and a standard deviation of 12. Using Chebyshev’s theorem, find at least what percentage of the observations fall in the intervals ± 2s, ± 2.5s, and ± 3s. Here ± 2s ...The mean monthly mortgage paid by all home owners in a town is $2365 with a standard deviation of $340. a. Using Chebyshev’s theorem, find at least what percentage of all home owners in this town pay a monthly mortgage ...Explain the concept of the percentile rank for an observation of a data set. According to www.money-zine.com, the average FICO score in the United States was around 692 in December 2011. Suppose the following data represent the credit scores of 22 randomly selected loan applicants. a. Calculate the ...Post your question

0