4. explanation: The mean is all the number added together and then divided by that amount of numbers. So, 1+6+2+4+4+3+5+5+2+8=40. 40 divided by 10 (the amount of numbers) which is 4. So the mean is 4.
5. explanation: The MAD is the mean absolute deviation which means the average of how much the data value differ from the mean. So, first we find the mean which is 4.(if we didn't do it we would have to find the mean if you are confused on how to find the mean see my explanation for 4.) Then you subtract the numbers that make up the mean from 4. So 4-1=3, 6-4= 2, 4-4=0, 4-4=0, 4-3=1,5-4=1,5-4=1,4-2=2,8-4=4. So add these numbers up and find the mean again. So 14 divided by 10 equals 1.4. So the MAD is 14.
