Question

a 9th class English book contains 200 pages a page is selected at random what is the probability that the number on the page is divisible by 10

Answer 1

no of pages=200
pages divisible by10=20
probability =20/200
=1/10
=0.1@nswer

Answer 2

Given:

A 9th class English book contains 200 pages. A page is selected at random.

To find:

The probability that the number on the page is divisible by 10.

Solution:

The probability of getting a number on the page which is divisible by 10 is 0.1 or 1/10.

To answer this question, we will follow the following steps:

As we know that probability of getting an outcome B or P(B) is equal to the number of favourable outcomes or n(B) divided by a total number of outcomes or n.

This means

$P(B) = \frac{n(B)}{n}$

Now,

As given, we have,

The total number of pages in the book = 200

or total number of outcomes = 200

Out of 200,

The number of pages which contains a number that is divisible by 10

$= \frac{200}{10}$

$= 20$

So,

When a page is selected at random, the probability of getting a number on the page which is divisible by 10

$= \frac{20}{200}$

$= \frac{1}{10}$

$= 0.1$

Hence, when a page is selected at random, the probability that the number on the page is divisible by 10 is 0.1 or 1/10.