If the time estimates for an activity are a=10,m=12 and b=20,the variance according to a beta distribution is
A)1.33
B)1.67
C)2.79
D)3.05

Name: If the time estimates for an activity are a=10,m=12 and b=20,the variance according to a beta distribution is A)1.33 B)1.67 C)2.79 D)3.05
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Quizplus · Accepted Answer

The variance of a beta distribution is given by:$$\sigma^2=\frac{ab}{(a+b)^2(a+b+1)}$$Substituting the given values, we get:$$\sigma^2=\frac{10	imes20}{(10+20)^2(10+20+1)}=2.79$$

If the Time Estimates for an Activity Are A=10,m=12 and B=20,the