in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?
70/100×55/100=77/200
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To find the probability that both a randomly chosen boy and girl can ride a bicycle, we need to find the product of the probability that a boy can ride a bicycle and the probability that a girl can ride a bicycle.
Let's first calculate the probability that a randomly chosen boy can ride a bicycle. We are told that 70% of the boys can ride a bicycle, so the probability is 0.70 or 70%.
Next, let's calculate the probability that a randomly chosen girl can ride a bicycle. We are told that 55% of the girls can ride a bicycle, so the probability is 0.55 or 55%.
To find the probability that both a randomly chosen boy and girl can ride a bicycle, we multiply the probabilities together:
0.70 (probability that a boy can ride a bicycle) × 0.55 (probability that a girl can ride a bicycle) = 0.385
Therefore, the probability that both a randomly chosen boy and girl can ride a bicycle is 0.385 or 38.5%.