Find the mean for the following frequency table :
zz.PNG

Gap-fill exercise

  
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Let Assumed mean A = 170


Class IntervalFrequency (f) Mid value (x) d = x-A
d = x-170		 fd
100-12016110-60-960 
120-14010130-40-400
140-16012150-20-240
160-18081700
180-200619020120
200-2204210 40160
220 - 2402230120
   Σfd=


Mean = x¯=A+ΣfdΣf = 170 + -120058

x =