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Question

The value of k if the point (9,2) passes through 2x+5y=k

A
23
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B
82
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C
28
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D
42
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Solution

The correct option is C 28

P(X=0)=0 P(X=1)=k P(X=2)=4k P(X=3)=2k P(X=4)=k P(X>4)=0

The sum of probabilities is 1

0+k+4k+2k+k+0=1 7k=1 k=17

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