Use short-cut method to find mean :
C. I.
0 – 10
10 – 20
20 – 30
30 – 40
40 – 50
Frequency [f]6
8
10
2
4
Answers
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1
hope it may help you dear :-)
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khatrit432:
its wrong answer the total frequency is 30 not 50
what is your name unknown
Tufel
its my name
thanks for the information @khatrit. Can I come to know how?
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