1000 (2)
1500 (3)
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To find the average of a set of numbers, you add all the numbers together and then divide by the total number of values. In this case, the sum of 124, 148, 207, and 21 is 500. Since there are 4 numbers in the set, you divide 500 by 4 to get an average of 125.
100 + 300 + 500 + 500 + 600 = 2000. Then divide by 5 to get 400. The mean of these five numbers is 400.
(500+750)/2 = 625
To determine the median, you have to count all 49 values from 500 to 549, then your median can be found if it's an odd number, or if even, add the two middle numbers and divide by 2.
You divide by the number of numbers - if you want the mean of three numbers you divide by 3, if you want the mean of a hundred numbers you divide by 100.