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11 August, 01:37

A box contains 8 green and 4 blue marbles. Two

marbles are selected (at once with no replacement).

Find the expected number of green marbles among

the selected ones.

(a) 1

(b) 1/3

(c) 2/3

(d) 1/2

(e) 4/3

(f) none of the above

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Answers (1)
  1. 11 August, 04:17
    0
    Total marbles = 4+8 = 12

    P (Green) = 8/12 = 2/3

    P (Blue) = 1/3

    So the answer is : (c) 2/3
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