review homework spongebob genetics worksheet
TRANSCRIPT
Review Homework
• Spongebob Genetics Worksheet
Frequency Table A frequency table is a list of outcomes in a
sample space and the number of times each outcome occurs
Sample: Make a frequency table of each person’s hair color in the room
BlondesBlack Brunettes Red Highlights
Probability Distribution A probability distribution is a function that
gives the probability of each event in a sample space. You can use a table or a graph to show the probability distribution.
Example: You have two spinners. Each spinner has 4
possible outcomes: 1, 2, 3, or 4. Show the probability distribution for the SUM of the numbers. Find the frequency and probability.
Sum 2 3 4 5 6 7 8
1 2 3 4 3 2 1
1/16 1/8 3/16 1/4 3/16 1/8 1/16
Frequency
Probability
Graphing the Distributions
0
1/20
1/10
3/20
1/5
1/4
3/10
1 2 3 4 5 6 7
Use a bar chart to graph the probability distribution
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Relative frequency
Lola wants to know if her dice is fair. She throws it 200 times and records her results in a table:
Number Frequency Relative frequency
1 31
2 27
3 38
4 30
5 42
6 32
3120027
20038
20030
20042
20032
200
= 0.155
= 0.145
= 0.190
= 0.150
= 0.210
= 0.160
Is the dice fair?
Relative FrequencyHow often an event happens compared
to the total number of events.
Country Frequency Relative Frequency
France 180
Italy 90
Spain 90
Total
Example : Wine sold in a shop over one week
180 ÷ 360 =
90 ÷ 360 =
90 ÷ 360 =
360
0.25
0.25
0.5
1
Relative Frequency
always added up to 1
Relative FrequenciesWhen the sum of the
frequencies is LARGE the relative frequency is a good estimate of the
probability of an outcome
Relative Frequencies
Boys
Girls Total
Frequency 300 200
Relative Frequency
Example Calculate the relative frequency for boys and girlsborn in the Royal Infirmary hospital in December 2007.
500
0.6 0.4 1
Relative Frequency adds up
to 1
When the sum of the frequencies is LARGE the
relative frequency is a good estimate of the
probability of an outcome
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