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Unformatted text preview: area between 4 and 5 + area between 5 and 7 = 0.18 + (0.5  .18) = 0.5
There are other ways to do this part which use the areas of the triangles. 4 c) What value separates the longest 10% of your daily waiting times from the remaining
90%?
Since = 0.5, we know that c has to be greater than 5 so c = 12.2361, 7.764.
since 12.2361 is larger than 10, the answer is 7.764
(2.3 pts.) 1.24 (p.31). The time (sec) that it takes a librarian to locate and entry in a file of
records on checkedout books has an exponential distribution with = 0.05. a) What proportion of all location times are less than 20 sec? At most 20 sec?
This is the same as the previous question since it doesn't make any difference if we include 20
or not for a continuous distribution.
0.6321
Note: for full credit, either the integral needs to be repeated or an explanation of why they are
the same needs to be...
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 Fall '08
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 Statistics

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