5. If the class marks of a frequency, distribution are 10, 15 and 20, then which class interval coresponds to the class mark 157
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Answer:
Correct option is
B
17.5,22.5
Class marks are: 15,20,25,...
Lower limit of class 20 is mean of 15 and 20=
2
15+20
=17.5
Upper limit of class 20 is the mean of 20 and 25=
2
20+25
=22.5
20 is the class mark for the class interval 17.5−22.5
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