find the mean of a -1, a, a + 1
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mean = sum of observations / no. of observations. then mean is = a-1 +a + a + 1 / 3 = 3a/3 = a mean of the the given data is a.
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Mean = a-1+a+a+1 = 3a
- - - - - -- - ---
3 3
Mean = a
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