the mean of observations 18, 14,15,19 , 15 ,a ,12, 15 and 16 is 16. find the value of a. Then find the median and mode.
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n(odd)=(n+1/2)th term
16=9+1/2th term
16=10/2th term
16=5th term
now,16^15=240
value of a =240
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