The mean of n observations 18,14,15,19,15,a,12,15,16 is 16. find value of a
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18+14+15+19+15+12+15+16+a)/9=16
124+a=16×9=144
a=144-124=20
a=20
please mark it as a brainliest answer
124+a=16×9=144
a=144-124=20
a=20
please mark it as a brainliest answer
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