Mean is about adding up numbers and then dividing it after so then you add up all of the numbers to get the total (2+11+2+4+ 5 = 35 ÷ 5 = 7). After you got your total you divided by the group of how many numbers of groups and that is how you calculate a mean.
Median is all about the middle number for example 3 2 1 and 2 is the median because it's the number in the middle. If it is an even group of numbers for example 1 2 3 4, the first thing you'll do is 2 + 3 = 5 ÷ 2 = 2.5 and that's how you figure out a median when its a even or odd number.
Mode is when you're looking for the number that are repeated more than once. For example 6 7 7 8 5 and the answer is 7 because it has been repeated more then once like twice. If there is like another group of numbers for example 6 8 5 you just write down nothing like just leave it blank because there is no mode in that group of numbers !
Anyways Hope you've learnt more from Mean, Median & Mode!
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