以下是我不会的英文数学问题 厉害的高手 请帮我解答一下问题 拜托了
4. For two random events C and D of a sample Ω P(C) = 0.25 , P(D) = 0.45 and P(C U D ) = 0.55 . Find :
a) P (C n D ) =
b) P D (C) =
c) PC (D) =
5. Carmela picks a card at random from a standard 52-card deck.
a) what is the probability that she draws a queen , given that the card is black ?
b) what is the probability that she draws a 5 , given that the card is less than 10 ?
c) what is the probability that she draws a spade , given that the card is red ?
6. A survey of 200 families living on a make believe island found that 92 of them owned a helicopter, 75 owned a hydroplane , and 23 owned both vehicles. What is the probability that a randomly selected families :
a) owns a hydroplane , given that it owns a helicopter ?
b) owns a helicopter , given that it owns a hydroplane ?