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Q.

Marks scored by 100 students in a 25 marks unit test of Mathematics is given below. Their median is

Marks0-55-1010-1515-2020-25
Students101842237

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a

12.7

b

12

c

12.3

d

12.62

answer is B.

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Detailed Solution

C.IfC.f
0-51010
5-101828
10-154270
15-202393
20-257100

N=∑ fi=100   N2=50 l=10,  F=28,  f=42
 Median=l+N2-Ff h

              =10+50-2542 5 =10+2242×5 =10+2.62 =12.62

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