Mr. and Mrs. Doran have a genetic history such that the probability that a child being born to them with a certain trait is 87%. If they have four children, what is the probability that at most two of their four children will have that trait? Round your answer to the nearest thousandth. ANSWER IS 0.085

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?