Here is the information about the project:

Activity Immediate Predecessors Optimistic Time Most Likely Time Pessimistic Time

A N$/$A $234$

B A $125$

C B $123$

D A $123$

E B $456$

F B$,$ C$,$ D $246$

G F $226$

Answer Q$8$ to Q$10$ according to this information. Use $2$ decimal points in the calculation.

Q$8.$ The mean activity time for activity F is $0\mathrm{.}67$

Group of answer choices

True

False

Flag question: Question $9$

Question $91$ pts

Make sure the Earliest Starting Time of activity F is $7\mathrm{.}33.$ The mean of the Total Project Completion Time is $14$ and the standard deviation is around $1\mathrm{.}25.$

Group of answer choices

True

False

Flag question: Question $10$

Question $101$ pts

Which of the following statement is not true?

Group of answer choices

The $85\%$ confidence interval is between $12\mathrm{.}20$ and $15\mathrm{.}80$ if we round the numbers to $2$ decimal points.

The probability that the project will be longer than $12$ days is more than $90\%.$

If we want to be sure $(90\%$ sure$)$ that the project will be completed by the day we promised. We should promise $14$ days.

The probability the project will be shorter than $8$ days is almost impossible.