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In: Statistics and Probability

An administrator wanted to study the utilization of long-distance telephone service by a department. One variable...

An administrator wanted to study the utilization of long-distance telephone service by a department. One variable of interest (let’s call it X) is the length, in minutes, of long-distance calls made during one month. There were 38 calls that resulted in a connection. The length of calls, already ordered from smallest to largest, are presented in the following table. 1.6 1.7 1.8 1.8 1.8 2.1 2.5 3.0 3.0 4.4 4.5 4.5 5.9 7.1 7.4 7.5 7.7 8.6 9.3 9.5 12.7 15.3 15.5 15.9 15.9 16.1 16.5 17.3 17.5 19.0 19.4 22.5 23.5 24.0 31.7 32.8 43.5 53.3

Which one of the following statements is not true?

A)The 10th percentile (or the first Decile) is 1.8 minutes.

B)The 20th percentile is (or the first Quintile) 3.0 minutes.

C)The 25th percentile (or the first Quartile) is 4.4 minutes.

D)The mode of X distribution is 1.8. E)Average X < Median X.

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Expert Solution

orchestra answered 1 year ago
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