The mean of 10 observation is 20 if nine of observations are 16,20,18,17,22,16,15, 20 and 17;find the 10th observation
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let the 10th observation be p
mean=sum of all the observations÷no.of observations
mean=20
mean=16+20+18+17+22+16+15+20+17+p÷10
20=161+p÷10
20×10=161+p
200=161+p
p=200-161
p=39
therefore the tenth observation is 39
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