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# The mean - formula and example

### The mean - formula

What is the Mean? The mean or average gives an average of a series of numbers. For example, the average body weight of my friends. The formula for calculating the mean is $$\bar{X} ={\sum{X} \over {n}}$$ X with the line on top we read: X bar (eks bar). It stands for the mean, the average of the scores in our sample. X stands for score. The capital Greek letter we read: Sigma. It stands for the Sum of the scores. The n we read: n. It stands for the number of scores in our sample.

### The mean -practice example

An experimenter wanted to know what quantity of food young rats eat. weighed the food each ate in 24 hours in grams. He chose 6 rats randomly from the colony of rats in his lab. Here are the data, The symbol for each score is X.

X
34
35
39
30
39
40

Looking at the formula above, we add all of scores and divide by ..........Next
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