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Unformatted text preview: al to 5kg, the cost is $50. For each
kilogram over 5kg, an extra cost $10 is charged (i.e. if the order is 6kg, the total cost is $60).
Find out the statistics of X:
(i)
[3’] Find out
;
(ii)
[3’] Find out
;
[3’] Tabulate the relationship between X and Y for
1, 2, 3, 4, 5 ;
[4’] Tabulate the relationship between Y and
, ignore the values with zero probabilities;
Find out the statistics of the shipping cost, Y:
(i)
[3’] Find out
;
3 (ii) [4’] Find out VAR . Solution:
According to the problem,
(a) For X, we have
∑
(i) 1 0.3 2 0.25 3 0.2 4 0.15 5 0.1 2.5 2.5 0.5 ;
∑ (ii)
1 0.3 (b) We have...
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 Fall '14

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