RS Aggarwal and V Aggarwal Maths Solutions Class 9 Chapter 15 - Probability

A coin is tossed 500 times and we get

head : 285 times, tail :215 times.

When a coin is tossed at random, what is the probability of getting

(i) a head? (ii) a tail?

Two coins are tossed 400 times and we get

Two heads:112 times; one head 160 times ;0 times; 0 head :128 times.

When two coins are tossed at random, what is the probability of getting

(i) 2 heads? (ii) 1 heads? (iii) 0 head?

Three coins are tossed 200 times and we get

three heads:39 times; two heads: 58 times;

one head :67 times: 0 head: 36 times.

When there coins are tossed at random, what is the probability of getting

(i) 3 heads? (ii) 1 head? (iii) 0 head (iv) 2 heads?

A die is thrown 300 times and the outcomes are noted as given below.

When a die is thrown at random, what is the probability of getting a

(i) 3? (ii) 6? (iii) 5? (iv)1?

In a survey of 200 ladies, it was found that 142 like coffee, while 58 dislike it.

Find the probability that a lady chosen at random

(i) likes coffee, (ii) dislikes coffee.

The percentages of marks obtained by a student in six unit tests are given below:

A unit test is selected at random. What is the probability that the student gets more than 60% marks in the test ?

On a particular day, at a crossing in a city, the various types of 240 vehicles going past during a time interval were observed as under:

Out of these vehicles, one is chosen at random, What is the probability that the chosen vehicle is a two wheeler?

On one page of a telephone directory, there are 200 phone number. The frequency distribution of their units digits is given below:

One of the number is chosen at random from the page. What is the probability that the units digit of the chosen number is (i) 5? (8)?

The following table shows the blood groups of 40 students of a class.

One student of the class is chosen at random. What is the probability that the chosen student has blood group(i) O? (ii) AB?

The table given below shows the marks obtained by 30 students in a test.

Out of these students, one is chosen at random. What is the probability that his marks lie in the interval 21-30?