calculate the standard deviation

(c) Why a person needs to be involved with a critical path activity? [2 marks] (d) Based on information given in Table 1 and Figure 1, calculate the standard deviation for all path. Value for X and Y will be determined by your unique zodiac sign as indicated in Table 1 My unique zodiac is Scorpio Table 1. Main activities of project management Activity A B C D E F G H I Optimistic Time (days) 5 8 9 5 5 Y 4 5 Pessimistic Time (days) X 11 15 5 Most Likely Time (days) 6 8 8 12 6 6 3 X Unique zodiac sign. Leo Aries, Gemini Taurus, Scorpio x 7 11 13 Y 2 4 8 9 X 8 E start B ( End D F Figure 1 precedence diagram project management Page 5 of 6