In a survey, 40 families were asked how many mobile phones they own. The frequencies for 0, 1, 2, 3 phones are 3, 12, 18 and x respectively. Find the value of x, given that every family was counted exactly once.

Question

Accepted Answer

7. Total frequency must be 40. So 3 + 12 + 18 + x = 40, i.e. 33 + x = 40, giving x = 7.

In a survey, 40 families were asked how many mobile phones they own. The frequencies for 0, 1, 2, 3 phones are 3, 12, 18 and $x$ respectively.
Find the value of $x$ , given that every family was counted exactly once.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 8 Organising Data practice

In a survey, 40 families were asked how many mobile phones they own. The frequencies for 0, 1, 2, 3 phones are 3, 12, 18 and x respectively.Find the value of x, given that every family was counted exactly once.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 8 Organising Data practice

In a survey, 40 families were asked how many mobile phones they own. The frequencies for 0, 1, 2, 3 phones are 3, 12, 18 and $x$ respectively.
Find the value of $x$ , given that every family was counted exactly once.