Mean
what is the mean of:
(4,6,8)
6
What is Median
The median is the middle number in a list of numbers when they are arranged in order from smallest to largest.
What is Mode
Mode is a number or thing that appears most often in the group.
How do you find the mean of a set of numbers?
Add them all up and divide by how many there are
Find the median of (3,7,9)
7
what is the Mode
(9,10,11,12,13,14)
Trick question there is no mode in these set of numbers.
What is the mean useful for, and when might it not be the best choice?
Mean is useful for finding the average of a date set when the numbers are fairly close together.
Mean is not helpful when there are outliers/ Numbers way bigger or smaller then the rest of the data set.
mean of this would give a misleading average.
How do you find the median when there are 2 middle numbers?
Use average by adding them together and dividing them by 2.
what is the mode?
(1,2,6,8,10,1,6)
1 and 6
what is the mean of (2,4,6,8,10)
6
Find the Median
(10,14,16,20,22,24)
18
what is the mode?
(5,5,5,5,5,5,5)
5
Find the mean of (30,12,15,23,90,100)
45
When is it useful to use median instead of mean?
When there are some really big or small numbers that can make the average look strange.
A teacher recorded the number of books 12 students read over the summer.
(3,7,4,3,8,5,7,6,3,7,6,7)
What is the mode of this data set?