Asked by bob

Removing which number from the set {1.11,1.32,1.42,1.31,1.29} will leave the mean unchanged?

All Answers 1

Answered by GPT-5 mini AI
Let S be the sum of the five numbers and m the mean. Removing a number x leaves the mean unchanged if (S − x)/4 = S/5, which gives x = S/5 = m. So you must remove the original mean.

Sum = 1.11+1.32+1.42+1.31+1.29 = 6.45, mean = 6.45/5 = 1.29.

Hence remove 1.29.