Question

A bag contains 6 white and 4 red balls. If a person draws 2 balls and receives 10 and 20 for a white and red balls respectively, then his expected amount is (a) 25 (b) 26 (c) 29 (d) 28 ​

Answer 1

Answer:

A bag contains 6 white and 4 red balls.

A white ball drawn then Rs10

If red ball then Rs20

⇒ Expectation =2(n1P1 + n2P2)

Here P1

​ = Probability of getting a white ball= Rs.10

Here P2

​ = Probability of getting a red ball =Rs.20

∴ Expectation =2[0.6×10+0.4×20]

                        =Rs28.

Hence, the answer is Rs.28.

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