Question

A jar contains 6 pennies, 3 nickels and 6 dimes. A child selects 2 coins at random without replacement from the jar. Let X represent the amount in cents of the selected coins.

Find the probability X = 10..........................   

Find the probability X = 11. ..............................

Find the expected value of X. ...........................

Answer 1

A) P(X=10) = when 2 nickel select out of 3 nickles = 3/105=0.029

B) P(X=11)= one penny select one dime select

P(X=11)=36 /105=0.343

C) expected value E(X)=80.8

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