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The average height of 30 boys was calculated to be 150cm. It was detected later that one value of 165cm was wrongly copied as 135cm for the computation of the mean. Find the correct mean. |
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Answer» It is given that Mean height of 30 boys = 150cm So the total height = 150 (30) = 4500cm We know that Correct sum = 4500 – incorrect value + correct value By substituting the values Correct sum = 4500 – 135 + 165 = 4350 So we get Correct mean = Correct sum/30 By substituting the values Correct mean = 4530/30 = 151 cm Therefore, the correct mean is 151 cm. |
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