General Information
Benchmark Instructional Guide
Connecting Benchmarks/Horizontal Alignment
Terms from the K-12 Glossary
- Event
- Sample space
Vertical Alignment
Previous Benchmarks
Next Benchmarks
Purpose and Instructional Strategies
In middle grades, students began to identify sample spaces and explored basic probability by using theoretical probability for repeated experiments. In Mathematics for College Liberal Arts, students break the sample space up into subsets. Students also identify the union, intersection, and complement of other events.- Within this benchmark, students should use their knowledge of Venn Diagrams and set notation from the Logic and Discrete Theory (LT) benchmarks within their work of these Data Analysis and Probability (DP) benchmarks. The expectation is students are working with multiple events (2 or more).
- Instruction includes finding the sample space for an event and then subsets of that sample
space.
- For example, the sample space for rolling a die is S = {1, 2, 3, 4, 5, 6}. The sample space for rolling an even number, which is a subset, is S = {2, 4, 6}.
- Instruction includes the use of diagrams in order to explore and illustrate concepts of
complements, unions, intersections, differences and products of two sets.
- The intersection of two sets is denoted as A ∩ B and consists of all elements that are both in A and B.
- The complement of a set can be denoted as Ac, -A-, A′ or ~A. This is the set of all elements that are in the universal set S but not in A. Complements can be of unions or intersections.
- Instruction includes finding sample spaces for multiple events.
- For example, find the sample space of rolling an even number on a six-sided die
and flipping a head on a coin.
- Sample space for rolling a six-sided die: R = {1, 2, 3, 4, 5, 6}.
- Sample space for rolling an even number on a six-sided die: E = {2, 4, 6}.
- Sample space for flipping a coin: F = {H, T}.
- Sample space for flipping a head: H = {H}.
- Sample space for rolling a die and flipping a coin: S = {1H, 1T, 2H, 2T, 3H, 3T, 4H, 4T, 5H, 5T, 6H, 6T}.
- Sample space for rolling an even number and flipping a head: A = {2H, 4H, 6H}.
- Sample space for not rolling an even number and not flipping a head: B = {1T, 3T, 5T}.
- For example, find the sample space of rolling an even number on a six-sided die
and flipping a head on a coin.
- Instruction includes finding the sample space of union and intersections.
- For example, a deck of 16 cards has 4 red hearts, 4 red diamonds, 4 black spades,
and 4 black clubs, numbered 1 to 4.
- Sample Space for the deck of cards: S = {1H, 2H, 3H, 4H, 1D, 2D, 3D, 4D, 1S, 2S, 3S, 4S, 1C, 2C, 3C, 4C}.
- Sample Space for the intersection of red and 3s:
- Define the subset of Red: R = {1H, 2H, 3H, 4H, 1D, 2D, 3D, 4D}.
- Define the subset of 3s: 3s = {3H, 3D, 3S, 3C}.
- Define the intersection of Red and 3s: R ∩ 3S = {3H, 3D}.
- Sample Space for the union of clubs and not diamonds:
- Define the subset of clubs: C = {1C, 2C, 3C, 4C}.
- Define the subset of not diamonds: D′ = {1H, 2H, 3H, 4H, 1D, 2D, 3D, 4D, 1S, 2S, 3S, 4S, 1C, 2C, 3C, 4C}.
- Define the union of clubs and not diamonds: C ∪ D′ = {1H, 2H, 3H, 4H, 1D, 2D, 3D, 4D, 1S, 2S, 3S, 4S, 1C, 2C, 3C, 4C}.
- For example, a deck of 16 cards has 4 red hearts, 4 red diamonds, 4 black spades,
and 4 black clubs, numbered 1 to 4.
Common Misconceptions or Errors
- If finding the unions when the events are not mutually exclusive, students often count the intersection more than once because it is included in multiple sets.
- Students may forget about the values that are not in the sets.
- Students may confuse the symbols used in basic set notation
Instructional Tasks
Instructional Task 1 (MTR.7.1)- The table below provides information on 10 students within Student Government. For each
student, their sex, age, whether or not they plan to go to college, if they play a sport, and how
many honors courses they are currently enrolled in.
- Part A. What is the sample space for number of colleges these students plan to apply to?
- Part B . What outcomes from the sample space in part A are in the event that the student plans to study business?
- Part C
.
Consider the following 3 events
.
For
each list
,
which
students would be make up
the event:
- F = The selected student is female
- S = The selected student plays a sport
- A = The selected student is less than 18 years old
- Part D
.
Based on part C, which outcomes are in the following events?
- F ∪ S
- (F ∪ S)′
- F ∩ A
- Ac
Instructional Items
Instructional Item 1- What is the sample space of not rolling a number greater than 4 on a six-sided die?
Instructional Item 2
- What is the sample space of not rolling a number greater than 4 on a six-sided die and flipping a head on a coin?