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? Dice with a sum of 7 is more likely than a sum of 9.
True
What average is affected by outliers? (mean, median, or mode)
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