SOLUTION: A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles ar

Algebra ->  Probability-and-statistics -> SOLUTION: A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles ar      Log On

Hi,         

P(choosing one red from the full bag) = 10/13

P(choosing 2 red, replacing the first) = 10/13*10/13 = 100/169 = .5917



Note: w/o replacement, that is, first red marble gone from bag:  P = 10/13*9/12