Transcript 13-2 Probability Distributions and Frequency Tables

13-2
Probability
Distributions and
Frequency Tables
Frequency Table: a data display
that shows how often an item
appears in a category
Relative Frequency: the ratio of
the frequency of the category to
the total frequency
Problem 1: Finding Relative Frequencies
The results of a survey of students’ music
preferences are organized in the frequency
table. What is the relative frequency of
preference for rock music?
Type of Music Preferred
Frequency
Rock
10
Hip Hop
7
Country
8
Classical
5
Alternative
6
Other
4
What is the relative frequency of preference for
• Classical?
• Country?
Type of Music Preferred
Frequency
Rock
10
Hip Hop
7
Country
8
Classical
5
Alternative
6
Other
4
Problem 2: Calculating Probability by
using Relative Frequencies
A student conducts a probability experiment by
tossing 3 coins one after another. Using the results
shown, what is the probability that exactly two heads
will occur in the next three tosses?
A student conducts a probability experiment by
spinning the spinner shown. Using the results in the
frequency table, what is the probability of the spinner
pointing at 4 on the next spin?
Probability Distribution: shows the
probability of each possible outcome
Can be shown using a frequency table
Problem 3: Finding Probability
Distribution