11. The mean of the following data is 42. Find the missing frequencies – InterviewSolution

1.	11. The mean of the following data is 42. Find the missing frequencies aand y if the sum of frequencies is 100.Class interval 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80Frequency 7 10x 13y 10 149[CBSE 2014
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