Middle Measures
3. Bob has a fish tank with the following items in it: 2 clown fish, 1 puffer fish, 3 goldfish, 2 coral, 4 plants, 210 rocks, and 2 snails. Find the mode, or the number that appears most often.
2
How long do most 6th graders spend on homework each night?
Statistical Question
16. What is the median of the data represented in the box plot?
40
10. Find the median of the dot plot.
1
13. The histogram shows the number of books read by four different age groups over the summer. How many total books were read from the entire group?
125 books
2. Bob has a fish tank with the following items in it: 2 clown fish, 1 puffer fish, 3 goldfish, 2 coral, 4 plants, 210 rocks, and 2 snails. Find the median, or middle value.
2 clown fish OR 2 coral OR 2 snails
Who received the highest score in this class on the last math quiz?
Not a statistical question
11. What is the interquartile range of the data represented in the box plot?
30
12. What is the median of the data represented in the dot plot below?
11
15) The histogram shows the lengths of kite strings held by students in a contest. How long were most students’ kite strings?
6-10 in.
1. Bob has a fish tank with the following items in it: 2 clown fish, 1 puffer fish, 3 goldfish, 2 coral, 4 plants, 210 rocks, and 2 snail. Find the MEAN, or average.
32 items
How far away from school do students live?
Statistical Question
The minimum of a set of data is the ____________, where as the maximum of a set of data is the ____________.
A. Smallest
B. Largest
The minimum of a set of data is the SMALLEST, where as the maximum of a set of data is the LARGEST.
True or False: The information given on a dot plot can be used to create a box-and-whisker plot.
True! A box-and-whisker plot and a dot plot use the same information, as well as provide the same information -- median, range, etc.
True or False: A histogram can be used to find all measures of central (mean, median, range, etc.).
False! It does not give specific information about a set of data.
4. Bob has a fish tank with the following items in it: 2 clown fish, 1 puffer fish, 3 goldfish, 2 coral, 4 plants, 210 rocks, and 2 snails. Find the range of the data.
209
What is a statistical question?
A statistical question has more than one answer.
Explain how to find the interquartile range on a box-and-whisker plot.
Subtract the upper quarter from the lower quartile.
Explain how to find the MOde of a set of data.
MO stands for MOST OFTEN. The mode is a value that appears most often in a set.
Explain what a histogram is used for.
A histogram is a type of bar graph that represents the frequencies of data with intervals or categories.
5. Bob has a fish tank with the following items in it: 2 clown fish, 1 puffer fish, 3 goldfish, 2 coral, 4 plants, 210 rocks, and 2 snails. What is the outlier? Why is this the outlier?
210 rocks; 210 is significantly higher than the other given amounts.
Give an example of a statistical question.
Answers will vary
Explain how to find the range of a set of data.
Subtract the highest value from the lowest value.
Explain how to find the median, or middle, of the set of data.
Put the data in order from least to greatest. Cross out the values in order from least to greatest until there is one or two values left.
If, there are two values left then, add them together and divide by two.
14. Alana rode her bicycle 10 miles on Monday, 20 miles on Tuesday and 30 miles on Wednesday. What is the mean number of miles she rode her bike in the three-day period?
20 miles