The following table is a probability distribution for the random variable x. x f
ID: 2505867 • Letter: T
Question
The following table is a probability distribution for the random variable x.x f(x)
6 0.30
10 0.50
15 0.20
1 The expected value of x is: E(x) = ______.
a 8.2
b 8.9
c 9.8
d 10.3
2 The variance of x is: var(x) = _______.
a 8.57
b 9.76
c 10.84
d 13.56
The following table is a probability distribution for the random variable x.
x f(x)
6 0.30
10 0.50
15 0.20
1 The expected value of x is: E(x) = ______.
a 8.2
b 8.9
c 9.8
d 10.3
2 The variance of x is: var(x) = _______.
a 8.57
b 9.76
c 10.84
d 13.56
Explanation / Answer
1.) (6*.3)+(10*.5)+(15*.2)=9.8 So C
2.) ((9.8-6)^2)*.3 + ((9.8-10)^2)*.5 + ((9.8-15)^2)*.2 = 4.34+0.01+5.41 = 9.76 So B
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