Means of four observation is1 2 if first ,second,third,fourth observations one decreased by 1,2,3,4respectively then fimd new mean
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Let the four observation be a, b, c and d.
Mean = 12
a+b+c+d/4 = 12
Mean = a-1 + b-2 + c-3 + d-4/4
a+b+c+d/4 - 10/4 = 12-2.5
= 9.5 answer
Let the four observation be a, b, c and d.
Mean = 12
a+b+c+d/4 = 12
Mean = a-1 + b-2 + c-3 + d-4/4
a+b+c+d/4 - 10/4 = 12-2.5
= 9.5 answer
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