A short project consists of 3 tasks, which are done in series (sequentially): A -> B -> C.

TASK are A, B, C

EXPECTED DURATION

8, 12, 9 (days)

STANDARD DEVIATION

1.3, 6.6, 4.7

A 8 1.3

B 12 6.6

C 9 4.7

Determine the standard deviation of the critical path (CP). Round your result to 2 decimal places, if applicable.