英语翻译
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)\x05P (C n D ) =
b)\x05P D (C) =
c)\x05PC (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