Probability 4
Write the answers to these questions as fractions.
1.A dice is rolled. What is the probability that the score will be
a) an odd number,b) greater than 4,c) less than 5?
2.One letter is chosen at random from the word “SUCCESSFUL”. What is the probability that the letter is
a) an S,b) an E,c) a C or an S,d) a vowel?
3.A bag contains 3 red, 4 green and 5 blue counters. One counter is chosen at random. What is the probability that the counter is
a) red,b) green,c) blue,d) red or blue?
4.One card is chosen from a normal pack of 52. What is the probability that the card will be
a) a king,b) a club,c) a red card,d) a black two?
5.A bag of sweets contains 20 candy twists, 13 mints and 9 fruit lumps. If one sweet is chosen without looking what is the probability that it will be
a) a candy twist,b) a candy twist or a mint,c) not a mint?
6.In a class of 30 children 15 are wearing trainers, 8 are wearing glasses and 12 have black hair. One child is chosen at random. What is the probability that the chosen child
a) is wearing trainers,b) is not wearing glasses,c) has black hair?
7.The table shows the number of matches in a sample of 100 boxes.
Number of matches / 38 / 39 / 40 / 41 / 42 / 43Number of boxes / 10 / 35 / 0 / 20 / 25 / 10
What is the probability that a box selected at random will contain
a) 39 matches,b) more than 39 matches,c) at least 39 matches?
8.This table shows the marks out of 5 scored by the members of a class.
Mark / 0 / 1 / 2 / 3 / 4 / 5Number of pupils / 2 / 5 / 9 / 1 / 1 / 12
What is the probability that a pupil chosen at random will have scored
a) full marks,b) more than 2 marks,c) less than 3 marks?