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