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class : 100-120 120-140 140-160 160-180 180-200frequency :10 p 10 q 5 = 60 |
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Answer» By the problem 10+p+10+q+5=60 =>q =35-p Class . Mid value. Freq 100-120. 110 10 120-140 130 p 140-160 . 150. 10 160- 180 . 170. 35 -p 180-200 . 190. 5 Given mean = 145 110*10+130*p+150*10+170*(35-p)+190*5=145*60 =>50p= 1100+1500+5950+950-8700 =>50p=800 =>p =16 |
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