Relative Frequency Tables
Q: What is the total number of vehicles in the table?
A: 36
What does the mean of a data set represent?
The average of the numbers.
What does median mean?
The middle number when the data is in order.
What does mode mean?
The number that appears most often.
True or False: All sections of a circle graph add up to 100%.
True
Q: What is the relative frequency (decimal) for cars?
A: 0.22
Find the mean of: 4, 6, 10
6.67
Find the median of: 3, 5, 7, 9, 11
7
What is the mode of: 2, 4, 4, 6, 8
4
A circle graph shows 25% for one category.
What fraction of the circle is this?
1/4
Q: What percentage of vehicles are trucks?
A: 36%
Find the mean of: 70, 80, 90, 100
85
Find the median of: 4, 6, 8, 10
7
(6 + 8 ÷ 2)
Can a data set have two modes?
Yes (it is called bimodal).
A survey shows:
Walking: 40%, Bus: 35%, Car: 25%
Which section would be closest to half the circle, and why?
Walking, because 40% is closest to 50%.
Q: Which type of vehicle has the lowest relative frequency, and what is its percentage?
A: Hybrid – 8%
A data set has a total of 60 and 5 numbers. What is the mean?
12
Why must numbers be placed in order before finding the median?
To correctly identify the middle value.
What is the mode of: 3, 5, 5, 7, 7, 9
5 and 7
A circle graph shows:
Music: 52%, Games: 33%, Reading: 15%
Which section would be more than half the circle?
Music
Q: If this data were shown in a circle graph, which vehicle type would have the largest section and why?
A: Truck, because it has the highest frequency (13) and highest percentage (36%).
The mean of four numbers is 20. The total of the numbers is 80.
If one number is 50, what must the other three numbers add up to?
30
(80 − 50 = 30)
A data set has 6 numbers. The two middle numbers are 10 and 14. What is the median?
12
What does it mean if a data set has no mode?
All numbers appear the same number of times.
Make a Circle Graph
10 students like Math
10 students like Phys. Edu
5 students like science
3 students like other