Line Plots
Students recorded how many laps they could run around a track. They recorded their data in the dot plot below. How many students recorded their data?
0
0 0 0 0
0 0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
1 2 3 4 5 6 7
12 students
Count all the dots
The stem and leaf plot below represents test scores for a class. How many students took the test?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
16 students
Count all the numbers in the leaf side of the stem and leaf chart
Which of the following questions would require the collection of data?
A. Which chicken wing flavor is your favorite?
B. What is your last name?
C. What is the holiday celebrated on the last day of October each year?
D. What restaurant is at 13400 Mulberry Street?
A. Which chicken wing flavor is your favorite?
When a question is asking for the spread, what do you need to find?
The Range
When a question asks for the middle number what do you need to find?
The Median
Students recorded how many laps they could run around a track. They recorded their data in the dot plot below. What is the spread of the data?
0
0 0 0 0
0 0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
1 2 3 4 5 6 7
6 laps
Spread means Range: greatest - least
7 - 1 =6
The stem and leaf plot below represents test scores for a class. What is the mode of the test scores?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
84
Mode: Most often
Find which test scores happens the most.
84 occurs 3 times
Below is a list of test scores from a 4th grade class
56, 74, 91, 82, 74, 88, 89, 65, 74, 97
Which of the following is true?
A. 2 students scored below a 60
B. 3 students scored a 74
C. 12 students took the test
D. The highest test score was a 100
B. 3 students scored a 74
When a question asks for the most often what do you need to find?
The Mode
When a question asks for the fair share or average what do you need to find?
The Mean
Students recorded how many laps they could run around a track. They recorded their data in the dot plot below. What is the mode of the data?
0
0 0 0 0
0 0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
1 2 3 4 5 6 7
3
Mode: most often
Find which number has the most circles above it
The stem and leaf plot below represents test scores for a class. What is the median of the test scores?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
79.5
Median: middle, line them up in order and cross out until you get to the middle. If there's 2 in the middle add them together and divide by 2
62, 67, 67, 69, 70, 73, 75, 78, 81, 84, 84, 84, 85, 92, 98, 99
78 + 81 = 159, 159/2 =79.5
The teacher is going to collect all of the in the class books and divide them out equally between the students. The number of books each student gets represents the ____________.
A. Range
B. Mode
C. Median
D. Mean
D. Mean
The numbers below represent the ages of the students in a karate class.
21, 18, 12, 17, 12
For this data, what is the range?
9
Range is the greatest - least
21- 12 = 9
The numbers below represent the ages of the students in a karate class.
21, 18, 12, 17, 12, 11, 14, 16
What is the median age of the students?
15
Median: middle, line up all numbers from greatest to least and find the middle
11, 12, 12, 14, 16, 17, 18, 21
If there are 2 medians, add them and divide them by 2
14 + 16 = 30
30/2 = 15
Students recorded how many laps they could run around a track. They recorded their data in the dot plot below. What is the total amount of laps all the students ran?
0
0 0 0 0
0 0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
1 2 3 4 5 6 7
48 laps
Add up all of the laps
7+7+6+5+5+4+3+3+3+2+2+1=48
The stem and leaf plot below represents test scores for a class. What is the average of the test scores?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
79.25
Average means Mean: Add up all then divide by how many
62+67+67+69+70+73+75+78+81+84+84+84+85+92+98+99= 1,268
1268/16= 79.25
The line plot below shows how much money parents spent at the book fair. How much money was spent by the four people that spent the greatest amounts at the book sale?
0
0 0 0 0
0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
21 22 23 24 25 26 27
$104
Add up the 4 highest numbers
25 + 26 + 26 +27 = 104
Look at the following prices for new refrigerators.
$425, $530, $725, $675, $425
What is the mode?
$425
Mode is the one that occurs most often
$425 is the only number that occurs twice
The numbers below represent the ages of the students in a karate class.
21, 18, 12, 17, 12, 11, 14, 16
What is the average age of the students?
15.125
Average means Mean: add up all the numbers then divide by how many numbers
21+18+12+17+12+11+14+16 = 121
121/8 = 15.125
Students recorded how many laps they could run around a track. They recorded their data in the dot plot below. What is the mean of the data?
0
0 0 0 0
0 0 0 0 0 0 0
<----|----|----|----|----|----|----|---->
1 2 3 4 5 6 7
4
Add up all of the laps
7+7+6+5+5+4+3+3+3+2+2+1=48
Then divide by the number of students that ran laps
48/12=4
The stem and leaf plot below represents test scores for a class. How many students scored less than the median?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
8 students
1. find the median.
2. count how many are below the median.
62, 67, 67, 69, 70, 73, 75, 78, 81, 84, 84, 84, 85, 92, 98, 99
78 + 81 = 159, 159/2 =79.5
8 scored less than a 79.5
The stem and leaf plot below represents test scores for a class. If the lowest score to make a C is a 70, how many students scored a C or better?
Stem | Leaf
6 | 2, 7, 7, 9
7 | 0, 3, 5, 8
8 | 1, 4, 4, 4, 5
9 | 2, 8, 9
12 students
Count all the students that scored 70 or higher
Look at the following prices for new refrigerators.
$425, $530, $725, $675, $425
What is the range?
$300
Range: the greatest - the least
725 - 425 = 300
Look at the following prices for new TVs.
$425, $530, $725, $675, $425, $565, $715
What is the average price of a new TV?
$580
Average means Mean
425+530+725+675+425+565+715=4060
4060/7=$580