Question

The marks obtained (out of 10) by 30 students of a class are as follows: 4, 6, 7, 5, 8, 3.0, 10.9.5,8.78
Meal
Find the highest and lowest marks obtained by the students of the class.
Find the range of the given data.
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som
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Calculate the arithmetic mean of the marks
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Answer 1

Answer:

Answer:- Using Shortcut Method

Class interval width (i) = 50−40=10

Marks X F d=

i

X−A

Fd

40-50 45 5 -2 -10

50-60 55 4 -1 -4

60-70 65 = A 3 0 0

70-80 75 6 1 6

80-90 85 2 2 4

ΣF=20 ΣFd=−4

Mean ( By step deviation formula) = A+

ΣF

ΣFd

×i=65+(

20

−4

×10)=65=2=63

C) Mean = 63