​The following tables gives production yield in kg.per hectare of wheat of 150 farms in a village. Calculate median.
​ PRODUCTION  50-53    53-56    56-59    59-62    62-65    65-68     68-71     71-74     74-77
KG/HECTARE      
 NO. OF FARMS      3          8          14            30          36          28            16           10            5 

Amrisha,
 
Production No. of farms(f) cf
50 - 53 3 3
53 - 56 8 11
56 - 59 14 25
59 - 62 30 55
62 - 65 36 91
65 - 68 28 119
68 - 71 16 135
71 - 74 10 145
74 - 77 5 150
  N = 150  

M = size of N2th item, N = f = 150M = size of 1502th item = 75th item
75th item lies in the 91th cumulative frequency. Hence, the median class is 62 - 65.

M = l1 + N2 - cff × i= 62 +1502 - 5536 × 3= 62 + 75 - 5536 × 3M = 63.66

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