If there are two possible outcomes of a chance situation, A and NOT A, which of the following statements is not true?
If one card is selected at random from a standard deck of cards, what is the probability that it is a queen?
Which of the following are complementary events?
Event A: a die lands with 6 on the uppermost face, Event B: a die lands with 3 on the uppermost face. Which of the following statements is true?
10 people work in an office. 3 of the 10 are women, 2 of the 10 produce sub-standard work and 4 of the 10 are either women or produce sub-standard work or both How many men are there whose work is satisfactory?.
Which of the following pairs of events are independent?
A wine seller sells red and white wine. He sells three times as much white as red. 20% of the white wine sales and 50% of the red wine sales are French. Given that he has sold some French wine, what is the probability it is red?
There are 4 people in an office. Anna receives twice as many calls as Ben. Between them Claire and Ben receive half of all calls. Ten percent of calls are for Del. If the telephone rings what is the probability it is for Anna?
If A and B are independent, P(A) is equal to which of the following?
To ascertain how many 16 year olds have taken drugs a survey was carried out involving 200 students at a particular school. They were asked to think of (but not say) a number between 1 and 10 (inclusive). If the number were divisible by 3 they were to answer the question ‘ Is your number even? If not, they were to answer the question ‘ have you ever taken drugs?’ In the survey, 50 students answered ‘ yes’. What is an estimate for the number of 16 year olds who have taken drugs?
