38. Assuming a PERT weighted average computation, what is the probability of completing the project

within plus-or-minus 3 standard deviations of the mean?

A. 68%

B. 99.74%

C. 95%

D.75%

정답 : B

해설 : 문제는 정규분포와 표준편차에 대한 내용입니다.

1 Sigma : 68.3%

2 Sigma : 95.5%

3 Sigma : 99.7%

6 Sigma : 99.9 % 입니다.

Reference

[1] PMP Pass p238