Mean
How do you find the mean?
Add all the information and divide it by the number of data points.
How do you find the median?
List all the numbers from least to greatest and cross off numbers until you find the middle.
How do you find the mode?
It is the data that is represented more than any data point.
15 + b = 23
b= ?
b = 8
What is the mean?
1, 1, 4, 2, 5, 2
2.5 or 2 1/2
Find the median:
4, 6, 6, 9, 10, 10, 11, 13, 28
10
Is it possible to have more than one mode?
Yes
26 = 8 + 2v
What is the first step of solving this equation?
Subtract 8 on both sides.
Students in 6th grade took a survey on what time they went to bed. Bedtimes were:
10, 10, 9, 9, 8, 10, 11, 9
9.5 or 9:30 pm
Find the median:
12, 13, 9, 15, 19, 12, 13
13
*Remember to put the numbers in order from least to greatest.
What is the mode?
12, 12, 13, 12, 14, 12, 15, 13, 13, 13, 12
12
−15 + n = −9
How do you find n?
n= ?
Add both sides by 15. n= 6
Ms. Sullivan's class had a Standards Mastery. Only 10 students took the test so far. Those 10 students made: 74, 78, 78, 82, 82, 90, 90, 90, 90, 100.
What is the mean so far?
85.4
Find the median of some test scores:
60, 100, 100, 90, 75, 85, 70, 50, 85
85
What is the mode?
60, 100, 100, 90, 75, 85, 70, 50
100
Opposite operation is the same as calling it the...?
Inverse Operation
10 students have completed a test in math class. They have all so far made 90s or above. However, one student turned in their test and scored a 60. What would that do to the mean? Why?
The mean would decrease because of the low score will be accounted into the class's high average.
What would happen to the median if you added a 100 to the data you have so far? Would it change a lot or not that much?
60, 100, 100, 90, 75, 85, 70, 50, 85
The median would stay the same or slightly increase depending on the information given.
8, 6, 7, 5, 6, 2, 5, 9, 9, 4, 5
What would happen if we added a 9 to our data?
The mode would be 9 and 5.
8x/10 = 4
x = ?
x = 5