Ratios
The ratio of red to blue balloons is 3:5. If there are 9 red balloons, how many blue balloons are there?
15
A runner travels 12 miles in 3 hours. What is the unit rate?
4 miles an hour
What do we call a question that expects different answers or data values from a group?
a statistical question
A histogram has frequencies of 3, 5, 7, and 4. How many observations are represented?
19
A triangle has a base of 12 cm and a height of 5 cm. What is its area?
30 cm2
A recipe uses 4 cups of flour for every 3 batches. How many cups are needed for 9 batches?
12 cups
Six notebooks cost $15. What is the cost per notebook?
$2.50
Find the range of 12, 17, 20, 24, 29.
17
A box plot has Q1 = 15 and Q3 = 27. Find the IQR.
12
A parallelogram has a base of 9 ft and a height of 7 ft. Find its area.
63 ft2
A teacher gives 6 tickets for every 4 students. How many tickets are needed for 18 students?
27 tickets
A 12-ounce drink costs $1.44. What is its cost per ounce?
$0.12 an ounce
Find the median of 8, 10, 13, 17, 22.
13
A box plot has a minimum of 8, Q1 of 14, median of 20, Q3 of 29, and maximum of 35. Between which two values is the middle 50% of the data?
14 and 29
A 12 m by 8 m rectangle has a 4 m by 3 m rectangle removed from one corner. Find the remaining area.
84 m2
The ratio of boys to girls is 7:8. If there are 21 boys, how many students are in the class altogether?
45
75% of the students at a school is 450 students. How many students attend the school?
600 students
The shortest player is 58 inches tall and the tallest is 73 inches tall. What measure of variability can be found from this information, and what is it?
15 inches
histogram has 4 students in 0–9, 7 in 10–19, 9 in 20–29, 6 in 30–39, and 2 in 40–49. How many students are represented?
28 students
A parallelogram has a base of 12 cm and a height of 6 cm. What is its area?
72 cm2
The ratio of red beads to blue beads is 5:8. There are 40 blue beads. How many beads are there altogether?
65
A 20-ounce drink costs $1.80 and a 12-ounce drink costs $1.32. How much is saved per ounce by buying the larger drink?
$0.02 an ounce
A data set has most values between 20 and 30, but one value is 75. Which measure of center would best represent the typical value?
Median
A box plot has Q1 = 16.5 and Q3 = 23. What percent of the data lies between these two values?
50%
A triangle has a base of 12 inches and a height of 7 inches. What is its area?
42 in2