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# Find the probability of a household not having any television. A company selected 4000 households at random and surveyed them to find out a relationship between income level and the number of television sets in a home. The information so obtained is listed in the following table:

Monthly Income(in Rs) Number of Televisions/household

0 1 2 Above 2

< 10000 20 80 10 0

10000 - 14999 10 240 60 0

15000 - 19999 0 380 120 30

20000 - 24999 0 520 370 80

25000 and above 0 1100 760 220

**Solution:**

Given, the table represents the relationship between income level and the number of television sets in a home.

A company selected 4000 households at random and surveyed them.

We have to find the __probability__ of a household not having any television

Probability of an event = Number of trials in which the event has happened / Total number of trials

From the given table,

Number of household not having any television = 20 + 10 = 30

So, number of trials in which the event has happened = 30

Total number trails = 4000

Probability of selecting a household not having any television = 30/4000

= 3/400

Therefore, the required probability is 3/400

**✦ Try This: **A bag contains 3 white, 5 black and 2 red balls, all of the same shape and size. A ball is drawn from the bag without looking into it. Find the probability that the ball drawn is a black ball.

**☛ Also Check:** NCERT Solutions for Class 9 Maths Chapter 14

**NCERT Exemplar Class 9 Maths Exercise 14.3 Problem 16(iii)**

## Find the probability of a household not having any television. A company selected 4000 households at random and surveyed them to find out a relationship between income level and the number of television sets in a home. The information so obtained is listed in the following table: Monthly Income(in Rs) Number of Televisions/household 0 1 2 Above 2 < 10000 20 80 10 0 10000 - 14999 10 240 60 0 15000 - 19999 0 380 120 30 20000 - 24999 0 520 370 80 25000 and above 0 1100 760 220

**Summary:**

A company selected 4000 households at random and surveyed them to find out a relationship between income level and the number of television sets in a home. The information so obtained is listed in the given table. The probability of a household not having any television is 3/400

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