Question

The marks obtained by 20 students of class 10th of a certain of a school are given below find the mean of the following.....
(I)marks obtained (xi) 5,10,15,2035,40,50. (ii) no.of students1,4,5,2,4,3,1 pls give correct answer pls pls give correct answer only plsssssss​

Answer 1

Step-by-step explanation:

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

Answer 2

Mean = (5+10+15+20+35+40+50)/20= 175/20= 8.75

Hope it will help you.

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