Q: The arithmetic mean of a set of numbers is 12. The mean of another set of numbers is 15. If combined mean of both sets is 12.5. Then find the ratio of frequency of both sets?
A.
3 : 1
B.
5 : 1
C.
3 : 2
D.
5 : 2
Correct Answer:
Option B -
Explanations:
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