Question

2. The mean of the following five numbers is 50: 20 35 50 60 85 a. Add four numbers to the list so that the mean of the nine numbers is still 50. b. Explain how to choose the four numbers to add to the list so that the mean does not change. c. What is the mean of the four numbers you added to the list? How does this mean compare to the original mean of 50?

Answer 1

we can add 45 55 40 60. we can find these numbers like this, if we need that the mean to be 50 we get that the sum of all the number need to be 450. But we already have 5 numbers and its sum is 250. So we need 4 numbers which sum is 200. And 45+55+40+60=200