Question

If it snows ​tomorrow, the probability is 0.5 that John will practice his trumpet. If it does not snow ​tomorrow, there is only a 0.4 chance that John will practice. Suppose the chance of snow tomorrow is 60​%. What is the probability that Justin will practice soccer this evening?

Answer 1

The probability that Justin will practice soccer this evening is 16%.

Explanation:

The probability that John will practice soccer is given by the product of the probability that it won't snow and the probability that he'll practice soccer. This is shown below:

practice soccer = (1 - 0.6)*0.4

practice soccer = 0.4*0.4

practice soccer = 0.16

The probability that Justin will practice soccer this evening is 16%,