The Average

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Average are set of data that we add together and divide by the number of data. The resultant is called mean value which is very useful and determine final marks obtained in your score card, to determine per capita income, Gas mileage of your car and many more. It is also known as Central Tendency, a measure of middle value.   

Mean (µ) is the average of all the terms. Add up all the terms and then divide it by the number of terms. It is also called as arithmetic mean or average.
Example 1: Edward took 7 tests in Math and scored 97, 84, 68, 89, 57, 62, 75. Find the average Math score?
Answer: Sum of all the numbers = 97 + 84 + 68 + 89 + 57 +62 +7
= 532
Mean or Average score = 5327 = 76
Example 2: In Olympics there was a running race in which 6 men participated. They completed the race in 1.24 hr, 1 hr, 1.7 hr, 1.52 hr, 3.2 hr, 4.3 hr. What is the mean of the race time?
 
Answer: 1.24 + 1 + 1.7 + 1.52 + 3.2 + 4.3 = 12.96 hr
Mean time = 12.966 = 2.16 hr
Example 3: Find the mean of 7, -2, 15, -6, 19, 3
Answer:

Mean = 6

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