Question

In a primary school 70% of the boys and 55% of the girls can ride a bicycle .if a boy and a girl are chosen at random what is the probability that both of them can ride a bicycle.that neither of them can ride a bicycle.

Answer 1

let B1 represent boy can ride bike
let B0 represent boy can't ride bike, same for G1 and G0

B1 G1-->.7*.55 = .385
B1 G0--> .7*.45 = .315
B0 G1--> .3*.55 = .165
B0 G0--> .3*.45 = .135

Take your pick, notice that the cases add to 1, as it should

Answer 2

In a primary school 70% percent of the boys and 5% percent of girls can ride byeclar if a boy and a girl is choose at random what is the probability that both of them can ride bike that neither of them can ride bike