f the company wants to estimate the true mean using a sample of size 40. With what confidence can they assert that their estimate is off by no more than .08

The amount used= 13.04- 1.9 = 11.14

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)