3. In a class of 100 students 75 are boys and 25 are girls. The chance that a boy gets a first class is 0.25 and the probability that a girl first class is 0.21 . find the probability that a student selected at random gets a first class. ( 3 marks )

The events that Aaron's team and Betty's team win their next games are \[ \text { of } P(A) \text { and } P(B) \text {. } \] dependent equal product

Jim works at an Auto centre and accidentally drops 4 bad spark plugs into a box with 20 good spark plugs. a. If he selects two spark plugs at random from the box without replacement, and the first spark plug selected was a good one, what is the probability that the second spark plug is bad?

3. In a class of 100 students 75 are boys and 25 are girls. The chance that a boy gets a first class is 0.25 and the probability that a girl first class is 0.21 . find the probability that a student selected at random gets a first class. ( 3 marks )

Michelle puts 7 red marbles and 5 blue marbles into a bag. If two marbles are chosen at random from the bag, one by one, without replacement, find the probability that two blue marbles are chosen. \( \begin{array}{ll}\text { A } \frac{25}{144} & \text { C } \frac{7}{22} \\ \text { B } \frac{49}{144} & \text { D } \frac{5}{33}\end{array} \)

A bag contains green balls and red balls only. A ball is taken at random from the bag. The probability of taking a green ball is 0.38 . Write down the probability of taking a a red ball, b a blue ball.