The mean is found by adding the numbers and dividing the sum by the number of numbers in the list. So 4+11+15+7+11+11+3+7= 69/8=8.625 in the tenths place is 8.6. The median is the middle value in a list ordered from smallest to largest. So 3, 4, 7, 7, 11, 11, 11, 15, the meadian is 7 because it is the middle value.