SOLUTION: from the following data find the missing frequency when mean is 15.38.
___________ ___________ ___________ ___________ ______
MARKS: 10 12 14 16 18
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Question 717065: from the following data find the missing frequency when mean is 15.38.
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MARKS: 10 12 14 16 18 20
FREQUENCY: 3 7 12 20 ? 5
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Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
If "n" is the missing frequency then:
Simplifying...
Eliminate the fraction by multiplying each side by (47+n):
Subtracting 15.38n:
Subtracting 702:
Dividing by 2.62:
Since "n" was a frequency, it should be a whole number. The reason we did not get a whole number for n must be either- We made a mistake. Check the work to see if we did. Or...
- The average we were given is a rounded-off number. In this case, "n" must be 8.
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