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Given the following frequency distributi...

Given the following frequency distribution with some missing frequencies
`{(class,10-20,20-30,30-40,40-50,50-60,60-70,70-80),(Frequency,180 , ? , 34, 180 , 136 , ? , 50):}`
If the total frequency is 685 and median is 42.6 then the missing frequencies are

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