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Question

The marks obtained by 40 class X students in a math paper of 50 marks, are presented in the table. Find the mean using direct method.
Marks obtainedNumber of students0−10310−20420−301330−401540−505


A
28.7
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B
25.2
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C
26.4
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D
29.9
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Solution

The correct option is A 28.7

Class mark for a class interval
=upper class limit+lower class limit2

e.g: for the first class interval of 0-10
= 0+102
= 5

Similarly the class mark for each class interval can be found. Look at the table.
Class intervalNumber of students(fi)Class mark(xi)fixi010351510204156020301325325304015355254050545225Totalfi=40fixi=1150
Mean=fixifi=115040=28.75


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