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

Question

25 July, 18:53

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Answers (1)

Know the Answer?

Daniel Whitney · Answer 1

Total marbles = 4+8 = 12

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

P (Blue) = 1/3

So the answer is : (c) 2/3

A box contains 8 green and 4 blue marbles. Twomarbles are selected (at once with no replacement).Find the expected number of green marbles amongthe selected ones.(a) 1(b) 1/3(c) 2/3(d) 1/2(e) 4/3(f) none of the above