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The probability that there would be 1,2 or 3 persons riding a bicycle are 0.85, 0.12 and 0.03 respectively. The expected number of persons per bicycle is

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1.18

answer is C.

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Detailed Solution

X=(x_i)	1	2	3
P(x=x_i)	0.85	0.12	0.03

Expectation is $μ$ = $\sum_{x_{i}}$ x_i p(x=x_i)

= 1x0.85+2x0.12+3x0.03

=0.85+0.24+0.09

1.18

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