When activity times are uncertain:. a. assume they are normally distributed.
b. calculate the expected time, using (a 4m b)/6.
c. use the most likely time.
d. calculate the expected time, using (a m b)/3.

b. calculate the expected time, using (a 4m b)/6.

Step-by-step explanation:

In project management, when activity times are uncertain, the appropriate approach is to calculate the expected time using the following expression:

Where 'a' is the most optimistic outcome, 'm' is the most likely time, and 'b' is the most pessimistic outcome.

Therefore, the answer is b. calculate the expected time, using (a 4m b)/6.

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value