Let x_{1},x_{2},x_{3},......,x_{n} be a set of numbers, average = (x_{1} + x_{2} + x_{3},+......+ x_{n})/n
When all the numbers in the set are the same, it is easy to find the average.
Example #3
Find the average of the following set of numbers:
6, 6, 6
6 + 6 + 6 = 18
18/3 = 6
Example #4
Find the average of the following set of numbers:
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12
12 + 12 + 12 + 12 + 12 + 12 + 12 + 12 + 12 + 12 + 12 = 132
132/11 = 12
What can we conclude from example #3 and example #4?
When the numbers in the set are all the same, the average is just the number itself.
Example #5
-5, 2, -1, 8
-5 + 2 + -1 + 8 = 4
4/4 = 1
Example #6
-8, 2, -11, 3, 0, 2
-8 + 2 + -11 + 3 + 0 + 2 = -12
-12/6 = -2
Example #7:
Mr. Peter collected 125 pencils from students during the past 5 days. On the average, how many pencils did he collect each day?
Average = 125/5 = 25
Example #8:
Last week, Samuel ordered pizza every day. After collecting all his receipts and getting the total, he realized that he spent a total of 63 dollars on pizza. On the average, how much money did he spend on pizza each day?
Average = 63/7 = 9
Jul 20, 21 10:08 AM
Learn to calculate the mean of a discrete random variable with this easy to follow lesson