7.8 simple probability 2
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Daily Homework Quiz For use after Lesson 7.8
You roll a number cube. Find the theoretical probability that you will roll:
1. a 5 2. an even number
Daily Homework Quiz For use after Lesson 7.8
You roll a number cube. Find the theoretical probability that you will roll:
1. a 5 2. an even number
ANSWER 16 ANSWER 1
2
Simple Probability
7.8
Essential Questions
What are the differences between permutations and combinations?
What are the differences between odds and probability?
How is probability used to make predictions?
What are the differences between experimental and theoretical probabilities?
Review
What is theoretical probability?How do you find it?
What is experimental probability?How do you find it?
What does a probability of 0 mean?What does a probability of 1 mean?
Probability
Number of favorable outcomes
Number of possible outcomes
EXAMPLE 3 Standardized Test Practice
SOLUTION
STEP 1
Find the experimental probability of a button being defective.
P(defective) =2
300
EXAMPLE 3 Standardized Test Practice
STEP 2
You could expect about 133 buttons in a shipment of 20,000 to be defective. The correct answer is C.
ANSWER
P(defective) =2
300 = x20,000
300x = 40,000300 300
x = 133 1/3
GUIDED PRACTICE for Examples 1, 2 and 3
What is the experimental probability of rolling a number greater than 3 when a number cube is rolled 100 times?
What is the theoretical probability of this event?
Number Cube1.
P(rolling a number greater than 3 )
= 48100
Number of favorable outcomesTotal number of rolls
= 0.48 = 48%
The experimental probability of rolling a number greater than 3 is 48% or 12/25.
ANSWER
16+14+18= 48
GUIDED PRACTICE for Examples 1, 2 and 3
theoretical probability of rolling a number greater than 3:
P(rolling a number greater than 3 )
Number of favorable outcomesTotal number of possible outcomes= 1
2
The theoretical probability of rolling a number greater than 3 is 50%.
ANSWER
= 36
3. You randomly draw a marble from a bag of yellow, blue, and green marbles 20 times and replace it. You drew yellow 8 times, blue 5 times, and green 7 times.
Estimate the probability that the next marble will be yellow? blue?
Daily Homework Quiz For use after Lesson 7.8
ANSWER Yellow: 40% or 2/5; Blue: 25% or 1/4
Homework
Worksheet 7.8
#11 A hit is a single, double, triple and homerun.
#16: Fraction to percentNumerator divided by denominatorMultiply by 100
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