13. It is desirable to make an estimate that has a greater than 95% chance
of being correct. Which of the following ranges of time for the comple-
tion of the project best describes this probability of being correct?
a. 33.31 to 31.36
b. 34.28 to 30.39
c. 14.39 to 33.48
d. 35.25 to 29.42
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