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Given the following information, determine the sample size needed if the standard time estimate is to be within 5 percent of the true mean 99 percent of the time.





Work Element


Standard Deviation (minutes)


Mean Observed Time (minutes)



1

0.20

1.10



2

0.10

0.80



3

0.15

0.90



4

0.10

1.00




(Round your answer to the nearest whole number, the tolerance is +/-1.)

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