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NSS College of Engineering (NSSCE), Palakkad
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Mean or Expected Time Solution

STEP 0: Pre-Calculation Summary
Formula Used
mean_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6
te = (t0+(4*tm)+tp)/6
This formula uses 3 Variables
Variables Used
Optimistic time - Optimistic time is the shortest possible time to complete the activity if all goes well. (Measured in Day)
Most likely time - Most likely time is the normal time activity would take. (Measured in Day)
Pessimistic time - Pessimistic time is the longest time that activity could take if everything is wrong. (Measured in Day)
STEP 1: Convert Input(s) to Base Unit
Optimistic time: 120 Day --> 10368000 Second (Check conversion here)
Most likely time: 180 Day --> 15552000 Second (Check conversion here)
Pessimistic time: 365 Day --> 31536000 Second (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
te = (t0+(4*tm)+tp)/6 --> (10368000+(4*15552000)+31536000)/6
Evaluating ... ...
te = 17352000
STEP 3: Convert Result to Output's Unit
17352000 Second -->200.833333333333 Day (Check conversion here)
FINAL ANSWER
200.833333333333 Day <-- Mean time
(Calculation completed in 00.031 seconds)

9 Other formulas that you can solve using the same Inputs

PERT expected time
pert_expected_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6 Go
Optimistic Time when Expected Time is Known
optimistic_time = (6*Mean time)-(4*Most likely time)-Pessimistic time Go
Most Likely Time when Expected Time is Known
most_likely_time = (6*Mean time-Optimistic time-Pessimistic time)/4 Go
Pessimistic Time when Expected Time is Known
pessimistic_time = 6*Mean time-Optimistic time-4*Most likely time Go
Optimistic Time when Standard Deviation is Known
optimistic_time = -(6*Standard Deviation-Pessimistic time) Go
Standard Deviation of an Activity
standard_deviation = (Pessimistic time-Optimistic time)/6 Go
Standard Deviation
standard_deviation = (Pessimistic time-Optimistic time)/6 Go
Pessimistic Time when Standard Deviation is Known
pessimistic_time = 6*Standard Deviation+Optimistic time Go
Variance
variance = ((Pessimistic time-Optimistic time)/6)^2 Go

1 Other formulas that calculate the same Output

Expected Time when Probability Factor is Known
mean_time = Scheduled time-(Standard Deviation*Probability factor) Go

Mean or Expected Time Formula

mean_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6
te = (t0+(4*tm)+tp)/6

What is PERT ?

PERT stands for project evaluation review technique. It involves uncertainty in the project completion. It is a numerical technique used in projects where the time cannot be accurately estimated.

What is most likely time?

Most likely time is based on experience and judgement based on time required if the activity is repeated number of times essentially under same situations. It reflects a situation " things are normal, nothing exciting."

How to Calculate Mean or Expected Time?

Mean or Expected Time calculator uses mean_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6 to calculate the Mean time, The Mean or Expected Time is the time taken for completion of an activity. It is found based on PERT technique. . Mean time and is denoted by te symbol.

How to calculate Mean or Expected Time using this online calculator? To use this online calculator for Mean or Expected Time, enter Optimistic time (t0), Most likely time (tm) and Pessimistic time (tp) and hit the calculate button. Here is how the Mean or Expected Time calculation can be explained with given input values -> 200.8333 = (10368000+(4*15552000)+31536000)/6.

FAQ

What is Mean or Expected Time?
The Mean or Expected Time is the time taken for completion of an activity. It is found based on PERT technique. and is represented as te = (t0+(4*tm)+tp)/6 or mean_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6. Optimistic time is the shortest possible time to complete the activity if all goes well, Most likely time is the normal time activity would take and Pessimistic time is the longest time that activity could take if everything is wrong.
How to calculate Mean or Expected Time?
The Mean or Expected Time is the time taken for completion of an activity. It is found based on PERT technique. is calculated using mean_time = (Optimistic time+(4*Most likely time)+Pessimistic time)/6. To calculate Mean or Expected Time, you need Optimistic time (t0), Most likely time (tm) and Pessimistic time (tp). With our tool, you need to enter the respective value for Optimistic time, Most likely time and Pessimistic time and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Mean time?
In this formula, Mean time uses Optimistic time, Most likely time and Pessimistic time. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • mean_time = Scheduled time-(Standard Deviation*Probability factor)
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