If your expected value is 110 and the standard deviation is 12, which of the following is true?

posted 2¼years ago by Natalie2000
© Copyright: Project Management Professional (PMP) Study Guide by Kim Heldman, Sybex Inc., Alameda, CA, USA, 2002, page 281, question 11
Expected Value | PERT | Standard Deviation

If your expected value is 110 and the standard deviation is 12, which of the following is true?

A. There is approximately a 99 percent chance of completing this activity between 86 and 134 days.
B. There is approximately a 68 percent chance of completing this activity between 98 and 122 days.
C. There is approximately a 95 percent chance of completing this activity between 98 and 122 days.
D. There is approximately a 75 percent chance of completing this activity between 86 and 134 days.