Counting
How many ways can 3 people stand in a line in order?
6
5/20 = 1/4 = 25%
What is the median of the following data set?
10, 12, 13, 14, 18, 20
13.5
Find the range of the following data set:
50, 32, 80, 65, 10, 75
70
A researcher wants to test if people over the age of 30 prefer Facebook or twitter. She asks 100 people to participate in a survey. What is the population for this study?
people over the age of 30
If you have 7 shirts, 3 hats, and 2 pairs of pants, how many different outfits can you create?
42
True or False? A sum of 7 is more likely to roll than a sum of 9.
True
What average is affected by outliers?
mean
Which measure of variation (range, standard deviation, or interquartile range) is most affected by outliers?
range
When you read a box plot, what does the vertical line in the middle of the box represent?
median
How many different 3-topping pizzas can be created if there are 8 possible toppings to select?
56
What is the probability of drawing two 5s in a row from a standard deck of 52 cards without replacing the first card?
4/52 * 3/51 = 12/2652 = 0.5%
Which average should you use to represent the central tendency of qualitative data?
mode
How do you find the interquartile range (IQR) of a box plot?
Q3 - Q1
Find the first quartile Q1 of the following data set:
20, 24, 26, 28, 40, 50, 55, 55
25
How many 5-digit zip codes exist?
10^5 or 100,000
In a certain Algebra 2 class of 28 students, 16 of them play basketball and 15 of them play baseball. There are 8 students who play neither sport. What is the probability that a student chosen randomly from the class plays basketball or baseball?
20/28 = 71%
If you are in a class where tests counts for 60% of your grade, and you have 3 tests, how much does each test count towards your final grade?
20%
If you go to the drive thru at Chick Fil-A, the average wait time is 15 minutes. At one store (call it Store A), the standard deviation is 5 minutes and at another store the standard deviation is 10 minutes (call it Store B). Which store are you most likely to wait in line 15 minutes?
Store A
When you see a bar graph, name two main aspects should you check on the graph.
the scale, whether the graph starts at 0, and what the measurements mean
How many 5-character ID badges can be created if the first two characters are letters A, B, C, or D (without repetitions) and the last three characters are numbers (with repetitions allowed).
12,000
In a class of 20 students, 8 did the homework and passed the test, 4 did the homework but did not pass the test, 3 passed the test but did not do their homework, and 5 did not pass the test and did not do their homework. What is the probability that a student passed the test given that they did not complete the homework?
3/8 = 38%
If these are your current homework grades, what do you need to earn on the next homework assignment to earn an average HW score of 80%?
100, 70, 75, 90
65
Find the standard deviation of the following data set:
5, 5, 8, 10
Round to two decimal places if necessary.
2.45
If I asked everyone in our class for their age, can I represent this data (of the entire class) with a pie chart?
Yes because everyone can only give one answer