Answers

2016-03-10T00:27:20+05:30
Let the lower limit be  x
 
upper limit =(x+8) ( class size is 8)
mid value of class =(upper limit +lowerlimt)
÷2
⇒20 =[(x+8)+x]÷2
⇒40=2x+8
⇒40 - 8 =2x
⇒32 =2x
∴x =16
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