IB Mathematics Analysis and Approaches Quiz
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STATISTICS AND PROBABILITY
Question 1
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A continuous random variable
X
X
X
has probability density function
f
(
x
)
=
3
x
2
f(x) = 3x^2
f
(
x
)
=
3
x
2
for
0
≤
x
≤
1
0 \le x \le 1
0
≤
x
≤
1
. Find the variance of
X
X
X
.
A
3
80
\frac{3}{80}
80
3
B
9
16
\frac{9}{16}
16
9
C
3
5
\frac{3}{5}
5
3
D
3
4
\frac{3}{4}
4
3
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