Question

find the mean of the Mark obtained by 30 student of class 1(out of 100) of a school given. 10, 20, 30,40,15,27,33,80,35,40,20,35,40,45,24,65,44,22,21,29,32,32,43,37,32,53,45,66,54,34​

Answer 1

Answer:

In the form of frequency distribution, the given data can be arranged as follows.

Marks Tally Marks Number of students

(Frequency)

10 - 20

20 - 30

30 - 40

40 - 50

50 - 60

60 - 70 IIII

IIII

IIII II

IIII II

IIII

III 4

5

7

7

4

3

Answer 2

Question :

↠Find the mean of the Mark obtained by 30 students of class 1(out of 100) of a school given.

10, 20, 30, 40 ,15 ,27 ,33 ,80 ,35 ,40 ,20 ,35 ,40 ,45 ,24 ,65 ,44 ,22, 21, 29, 32, 32, 43, 37, 32, 53, 45, 66, 54, 34​.  

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Before, finding the answer. Let's find out we can find the answer.

• In this question, we are asked to find the Mean of the data.
• So, to find the Mean of the Data, we must use the formula of :

$\boxed{ \sf Mean = \frac{Sum \: of \: all \: observations}{Number \: of \: observations} }$

_______________________________

Given :

• 10, 20, 30, 40 ,15 ,27 ,33 ,80 ,35 ,40 ,20 ,35 ,40 ,45 ,24 ,65 ,44 ,22, 21, 29, 32, 32, 43, 37, 32, 53, 45, 66, 54, 34​.

To find :

• Mean

Solution :

Mean ↴

= Sum of all observations/Number of observations

= 10 +20 + 30 + 40 + 15 + 27 + 33 + 80 + 35 + 40 + 20 + 35 + 40 + 45 + 24 + 65 + 44 + 22 + 21 + 29 + 32 + 32 + 43 +  37 + 32 + 53 + 45+ 66 + 54 + 34/30

= 1103/30

= 36.76

Therefore, the Mean of the following data is 36.76.