Statistics
Find the mean of: 12, 15, 18, 21, 24
18
Add up all the data points and then divide by how many data points there are.
Find the area of a rectangle with side lengths 8.5 and 6
51
A ride requires a height of at least 60 inches.
Let h represent height.
h ≥ 60
Simplify: 18:24
3:4
6 + 3² × 2
24
Find the median and range:
5, 12, 9, 20, 7, 14
Median = 10.5, Range = 15
Median: the middle number in the data set
Range: Maximum - Minimum
Find the area of a triangle with base 12 and height 7.5
45
Which is greater?
(3/5) ___ (4/7)
(3/5) > (4/7)
Find 35% of 80
28
Write an expression:
“Twice a number decreased by 5”
2x-5
Find the mean of the data set:
22, 18, 25, 30, 15, 20, 10
Find the area of a trapezoid with bases 10 and 16, height 6
78
Is this statement true or false?
|-24| < |-50|
24<50
A recipe uses 2 cups of sugar for every 5 cups of flour.
How much sugar is needed for 20 cups of flour?
8 Cups
Evaluate: 3(x + 4) - 2x when x = 5
22
Find the mean absolute deviation (MAD):
10, 12, 14, 16, 18
Mean = 14 → deviations: 4,2,0,2,4 → MAD = 12/5 = 2.4
A composite figure is made of:
Rectangle (10×6) and triangle (base 10, height 4)
60 + 20 = 80
A number x is greater than 5.
Which could be a possible values of x?
A) |-24|
B) 5
C) 6
D) |-2|
A) |-24| and C) 6
A $120 item is discounted by 15%. What is the new price?
$102
Simplify: 4x + 3 + 2x - 7
6x-4
Two classes recorded test scores:
Class A: 70, 75, 80, 85, 90
Class B: 60, 75, 80, 85, 100
Which class has greater variability and how do you know?
Class B, larger spread → larger MAD/range
A student uses the slanted side of a triangle as the height.
Explain why this gives an incorrect area and how to fix it.
The height must be perpendicular.
You can spend no more than $25.
Let x represent how much you spend.
Write an inequality and give one possible value of x
x ≤ 25, example: x = 20
A value increases from 40 to 50.
Find the percent increase.
25%
A student says:
5(x + 2) = 5x + 2
Explain the mistake and correct it.
5x+10
They forgot to distribute to both numbers.