Worksheet for chapter: Probability is presented below. The worksheets are provided for practice and self evaluation of students of class 9. Solutions are provided at the end of the page.
(1) The result of a survey of 1000 persons about a movie is showing below –
| Opinion | Number of persons |
| Likes | 620 |
| Dislikes | 480 |
Find the probability of a person chosen random to dislike the movie.
(2) A girl went to market to purchase a dress. The shop has dresses in different colours. The table below is showing data-
| Colour of dress | Number of dress |
| Red | 4 |
| Green | 3 |
| Yellow | 2 |
Find the probability of picking a red colour dress.
(3) Heights (cm) of 9 persons are as follows:
160 159 160.5 162 166 155 154 170 156
Find the probability that any of these person chosen at random who has height more than 160 cm.
(4) Marks of 30 students of class 9 for mathematics are as follows-
45 75 78 89 55 99 100 65 79 80
82.5 88 96 97 94 89 93 91 56 67
69 91.5 64 65 75 78 48 90 95 99.5
(i) Find the probability that a student get marks less than 60.
(ii) Find the probability that a student get marks more than 60.
(5) A group of sweat lover prepares a table of different sweats liked by the number of 50 members. The table is as follows:
| Name of sweat | Sweat liked by the members |
| Burfi | 10 |
| Jalebi | 6 |
| Imerti | 8 |
| Milk cake | 12 |
| Kheer | 10 |
| Kalakand | 4 |
Find the probability of that a member chosen at random
(i) likes milk cake (ii) likes burfi
(6) A bag has 20 red, 25 green and 30 black balls.
(i) Find the probability to take out red ball.
(ii) Find the probability of taking out 1 black and 1 yellow ball simultaneously.
(7) A book shelf has books as follows-
| Books | Number of books |
| History | 5 |
| English | 2 |
| Hindi | 4 |
| Mathematics | 5 |
Find the probability of taking out a book of History from the book shelf.
(8) In a bus 30 passengers are travelling. Information are given below –
| Age of the Passengers(Years) | Male Passengers | Female Passengers |
| Less than 10 | 2 | 1 |
| 10 – 20 | 1 | 4 |
| 20 – 30 | 2 | 4 |
| 30 – 40 | 5 | 3 |
| 40 – 50 | 2 | 6 |
Find the probability that a passenger chosen at random
(i) Male passengers aged 20 – 30.
(ii) Female passengers aged 40 – 50
Choose the correct answer-
(9) The probability of an event lies between
(i) 1 and 2
(ii) 0 and 1
(iii) None of the above
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