Analysis and Approaches for IBDP Maths Ebook 2 | Page 249
4. The probability distribution of a discrete random variable X is defined by
x 9
P( X � x)
� � , k � 0 , x � 3, 4, 5, 6, 7 .
2
16 5k
(a) Find the value of k .
(b) Find Var( X ) .
[3]
[4]
18
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Analysis and Approaches for IBDP Maths Ebook 2 | Page 248
Analysis and Approaches for IBDP Maths Ebook 2 | Page 250
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