The following table provides a probability distribution for the random variable x
.
()10.220.25−140.37
x 1 2 −1 4 f(x) 0.2 0.25 0.37
Find (≤1)
P
(
x
≤
1
)
. Answer
Find ()
V
a
r
(
x
)
3.3
3.3
1.82
1.82
6.38
6.38
2.53
2.53
6.3
6.3
2.51
2.51