1. How to solve ?
Mean & mode problems

2. Definition of mean & mode
Mean: The "mean" is where you add up all the numbers and then divide by the number of numbers.
Mode: The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list.

3. Step by step mean Example below of mean:
Problem: The mean of 29 test scores is What is the sum of these test scores?
Solution: To find the mean of n numbers, we divide the sum of the n numbers by n.  
 If we let n = 29, we can work backwards to find the sum of these test scores.  
 Multiplying the mean by the 29 we get:   77.8 x 29 = 2,256.2
Answer:  The sum of these test scores is 2,256.2

4. Step by step mode
Example below of mode:
Problem:  The number of points scored in a series of football games is listed below. Which score occurred most often?  7,  13,  18,  24,  9,  3,  18
Solution:  Ordering the scores from least to greatest, we get:  3,  7,  9,  13,  18,  18,  24
Answer:  The score which occurs most often is 18.

5. Understanding more
The mean is the arithmetic average, the average you are probably used to finding for a set of numbers - add up the numbers and divide by how many there are: ( ) / 6 = 89 1/6.
The mode is the value that occurs most often. In this case, since there are 3 90's, the mode is 90. A set of data can have more than one mode.

6. Try it yourself!
1) 18, 18, 15, 18, 18, 24, 21, 21, 24, 14
mean =
median =
mode =
2) 94, 69, 84, 69, 90, 75, 94, 90, 90, 9, 5
3) 4, 18, 18, 23, 23, 19, 8, 8, 8, 8, 28
4) 12, 15, 16, 17, 15, 17, 17, 17, 18, 17