The mean is just the average of the numbers.
It is easy to calculate: Just add up all the numbers, then divide by how many numbers there are.
In other words it is the sum divided by the count.
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You add the numbers together than divide by how many numbers you added together.
Example:
Seven numbers:
12, 56, 97, 4, 13, 32, 10
Sum = 224
224/7 = 32 (which happens to be one of the numbers but that is just a coincidence!)
to find the mean of a set of numbers you have to find the total sum of the data divided by the number of addends in the data.
add the numbers and divide them by how many numbers there are
If there are 2 numbers as the median, you find the mean of those 2 numbers. (add both numbers and divide by 2)
Add all the numbers and divide it by however many numbers you added, then that's how you get the missing number to help you complete the mean.
Oh, what a lovely collection of numbers you have there! To find the mean, you simply add them all up and then divide by how many numbers there are. So, for these numbers, you would add 1.2 + 1.4 + 1.5 + 1.7 + 2, and then divide by 5 to find the mean. Happy calculating!