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Question

Match the two columns
ColumnIColumnII(A) The class mark of the class interval(p) 13145150 is(B) In a frequency distribution, the mid – value of a(q) 110class is 10 and width of each class is 6. The upperlimit of the class is(C) The mean of eight numbers is 40. If one(r) 22.527.5number is excluded, their mean becomes30.The excluded number is(D) The class marks of a frequency distribution are(s) 147.515, 20, 25, 30,The class corresponding to the classmark 25 is
Choose the correct option:


A

A-p; B-s; C-q; D-r

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B

A-r; B-p; C-q; D-s

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C

A-s; B-p; C-r; D-q

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D

A-s; B-p; C-q; D-r

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Solution

The correct option is D

A-s; B-p; C-q; D-r


(A)s;(B)p;(C)q;(D)r

(A) Classmark
=145+1502=2952=147.5.


(B) Let the upper limit = x
Lower limit = y
xy=6 and x+y2=10x+y=20
On solving both the equations, we get x = 13 and y = 7

(C) Sum of the 8 observation =40×8=320
Sum of the 7 observation =30×7=210
Excluded observation is 320 - 210 = 110

(D) Class width = 20 - 15 = 5
Class mark = 25
Required class,
(2552)(25+52)22.527.5


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