Question 1: What is the probability of having an odd number in a single toss of a fair die?
Use the following information for question 2 and 3
The surname of 40 children in a class were arranged in alphabetical order,16 of the surnames begin with O and 9 of the surnames begins with A. 14 letters of the alphabet do not appear as the first letter of a surname.
Question 3: If more than one surname begins with a letter besides A and O, how many surnames begin with the letter?
The table gives the score of a group of students in an English language test.
|No. of Students||2||4||7||2||3||2|
Question 4: If a student is chosen at random from the group, what is the probability that he scored at least 6 marks?
Question 5: What is the probability that three customers waiting in a bank will be served in the Sequence of their arrival at the bank?
Question 6: The probability that Kodjo and Adoga pass an examination are ¾ and 3/5 respectively. Find the probability of both boys failing the examination.
Question 7: The mean of 20 observations in an experiment is 4. If the observed largest value is 23, Find the mean of the remaining observations.
Question 8: A group of eleven people can speak either English or French or both. Seven can speak English and six can speak French. What is the probability that a person chosen at random can speak both English and French?
If events X and Y are mutually exclusive, P(X) = 1/3 and P(Y) = 2/5, Use the information to answer questions 9 & 10.
Question 9: P (X n Y) is
Question 10: P (X u Y) is
11: A box contains 2 white and 3 blue identical marbles. If two marbles are picked at Random, one after the other, without replacement, What is the probability of picking two marbles of different colours?