What is the mean of all even nos between 11 &21
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12+14+16+18+20=80 mean by formula =sum of observations / no of observations 80/5 =16
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=>even numbers between 11 to 21 are: 12, 14, 16, 18,20
=>mean formula = sum of observations/total no.
=>12+14+16+18+20/5
=>80/5
=>16
thus, the mean of all even numbers between 11 to 21 is 16.
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