Question

find the mean of the following distribution​

Answer 1

Step-by-step explanation:

X:- 4+6+9+10+15÷5

mean = 44÷5

mean = 8.8

F:- 5+10+10+7+8÷5

mean = 40÷5

mean = 8

Answer 2

Given:

$\begin{array}{|c|c|c|c|c|c|}\cline{1-6} \bf x & 4 & 6 & 9 & 10 & 15\\\cline{1-6}\bf f & 5 & 10 & 10 & 7 & 8\\\cline{1-6}\end{array}$

x | f | fx

4 | 5 | 20

6 | 10 | 60

9 | 10 | 90

10 | 7 | 70

15 | 8 | 120

To find:

Mean of the following data = ?

Solution:

The given data is a grouped data.

Mean = Σfx ÷ Σf

⇒ Mean = (20 + 60 + 90 + 70 + 120) ÷ (5 + 10 + 10 + 7 + 8)

⇒ Mean = 360 ÷ 40

⇒ Mean = 90

∴ Mean of the given data = 90

KNOW MORE:

★ There are 2 types of data:

1. Grouped data
2. Ungrouped data

★ Mean for Grouped data = Sum of all term ÷ Total number of terms.

★ Mean for ungrouped data = Σfixi ÷ Σfi