16. A class test in mathematics was conducted for class X of a school. Following distribution
gives marks (out of 60) of students:
Marks
0-10 10-20 20-30 30-40 40-50
Number of students 8 22 12 10 5
Find the mean of the marks obtained.
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Step-by-step explanation:
frequency=£f=57
x=5:15:25:35:45
£f×x=40:330:300:350:225=57
mean=£f×x/£f
1245÷57=21.84
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