Your Practice Set – Applications and Interpretation for IBDP Mathematics
4 . The random variable X is defined such that E ( 8�7 X ) � 29 and Var ( �7 X ) � 147 .
( a ) Find E ( X ) .
( b ) Find Var ( X ) .
[ 2 ] Another random variable Y is defined such that Var ( Y) � 4.5 . It is given that X and Y are independent .
[ 2 ]
( c ) Find Var ( 10Y� 3 X) .
[ 2 ]
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