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Standard X

Mathematics

Finding Mean for Grouped Data When Class Intervals Are Not Given

The marks sco...

Question

The marks scored by two students $M, N$ in a class are given below. Find the mean .

65 marks

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70 marks

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85 marks

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90 marks

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Solution

The correct option is C 85 marks
Answer:- Using direct method
Using frequency distribution table

M
(x) N
(f) fx
98 50 4900
88 65 5720
87 80 6960
90 95 8550
70 100 7000
$Σ f = 390$ $Σ f x = 33130$
$∴ Average or mean = \frac{Σ f x}{Σ f} = \frac{33130}{390} = 84.94 ≃ 85$
The mean is 85.
C)85 Marks

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Q. Marks scored by

30

students of class

V I

are as given below:

38, 46, 33, 45, 63, 53, 40, 85, 52, 75, 60, 73, 62, 22, 69, 43, 45, 33, 47, 41, 29, 43, 37, 49, 83, 44, 55, 22, 35

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State:
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30

students of class

V I

are as given below:

38, 46, 33, 45, 63, 53, 40, 85, 52, 75, 60, 73, 62, 22, 69, 43, 45, 33, 47, 41, 29, 43, 37, 49, 83, 44, 55, 22, 35

and

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State:
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There are 50 students in a class and the average mark scored by the class in Maths is 65 out of 100. The total marks scored by all the students except Karan and Arjun is 3080. If the marks scored by Karan & Arjun are same, what are the marks scored by Arjun?

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M (x)	N (f)	fx
98	50	4900
88	65	5720
87	80	6960
90	95	8550
70	100	7000
	$Σ f = 390$	$Σ f x = 33130$

The marks scored by two students M,N in a class are given below. Find the mean .

The correct option is C 85 marksAnswer:- Using direct methodUsing frequency distribution tableM(x)N(f)fx 98504900 88 65 5720 87 80 6960 90 95 8550 70 100 7000 Σf=390 Σfx=33130∴Average or mean=ΣfxΣf=33130390=84.94≃85The mean is 85.C)85 Marks

The marks scored by two students $M, N$ in a class are given below. Find the mean .