Find missing frequency for grouped data 






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Find missing frequency for grouped data

1. The mean of a frequency distribution of 40 persons is 16.5. Find the missing frequencies.
Class  0  5  5  10  10  15  15  20  20  25  25  30  30  35  f  1  7  11  ?  ?  4  2 
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2. Mean of the following distribution is 18.1. Find the missing frequency.
Class  5  10  10  15  15  20  20  25  25  30  30  35  f  11  20  35  20  a  6 
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3. The median of a frequency distribution of 400 person is 38.5. Find the missing frequencies.
Class  11  20  21  30  31  40  41  50  51  60  61  70  71  80  f  42  38  a  54  b  36  32 
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4. The median of a frequency distribution of 1000 person is 87.50. Find the missing frequencies.
Class  40  59  60  79  80  99  100  119  120  139  f  50  ?  500  ?  50 
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