This question was previously asked in

Gujarat Engineering Service 2017 Official Paper (Engineering Aptitude)

- 33%
- 50%
- 67%
- 99%

Option 2 : 50%

Free

Gujarat Engineering Service 2019 Official Paper (Civil Part 1)

969

150 Questions
150 Marks
90 Mins

__Concept-__

**Probability Factor is given by**

\(z = \frac{{x - \bar x}}{\sigma }\)

Where,

σ is Standard Deviation

x is mean

For,

z = 0, P (Z) = 50 %

Z < 0, P (Z) < 50 %

Z > 0, P (Z) > 50%

When expected activity duration is considered then the probability factor z = 0. So 50% probability is considered for expected activity duration.

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