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# Fixed Intervals Help (page 3)

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By — McGraw-Hill Professional
Updated on Aug 26, 2011

#### Solution 2

For a single day, a sick-person-day is the equivalent of one person calling in sick. But this is not necessarily true for any period longer than one day. In this single-day example, we can multiply 1000 by 17.8%, getting 178, and this gives us both answers. There are, on the average, 178 sick-person-days on Mondays. An average of 178 individuals call in sick on Mondays.

#### Practice 3

Given the same scenario as that described in the previous two problems, what is the average number of sick-person-days on Mondays and Tuesdays combined? What is the average number of individuals who call in sick on Mondays and Tuesdays combined?

#### Solution 3

An average of 178 sick-person-days occur on Mondays, as we have determined in the solution to the previous problem. To find the average number of sick-person-days on Tuesdays, multiply 1000 by 14.4%, getting 144. The average number of sick-person-days on Mondays and Tuesdays combined is therefore 178 + 144, or 322. It is impossible to determine the average number of individuals who call in sick on Mondays and Tuesdays combined, because we don't know how many of the Monday–Tuesday sick-person-day pairs represent a single individual staying out sick on both days (two sickperson-days but only one sick person).

Practice problems for these concepts can be found at:

Descriptive Measures Practice Test

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