Frequency. Frequency Looking at how often something occurs in context

Frequency

FrequencyFrequency

Looking at how often something occurs in context.

P(odd) =

Example#1: You roll a six-sided die whose sides are numbered from 1 through 6. a) What is the probability of rolling an ODD number?

36

.5

P(“t”) =

b) What is the probability of rolling a number that starts with the letter “t”?

26

.33

Example #2: A jar contains 6 red, 5 green, 8 blue and 3 yellow marbles.

P(red) =

P(green) = P(blue) = P(yellow) =

622

522

822

322

.27

.23 .36 .14

Example#2: A jar contains 6 red, 5 green, 8 blue and 3 yellow marbles.

P(orange) = 0 0

Example #3: A deck of cards contains 52 cards made up of 4 different suits – Hearts, Diamonds, Spades, and Clubs.

a) What is the probability of drawing a heart?

13

P Heart52

.25

b) What is the probability of drawing a 3?

c) What is the probability of drawing a face card?

4

P a 352

.08

12

P face52

.23

Practice #4 The table gives the handedness and eyedness of a randomly selected group of 100 people.

Right-Right-EyedEyed

Left-Left-EyedEyed

Right-Right-HandedHanded

57 31

Left-Left-HandedHanded

6 6

a) What is the probability of getting a left-handed person?

12100

.12

Right-Right-EyedEyed

Left-Left-EyedEyed

Right-Right-HandedHanded

57 31

Left-Left-HandedHanded

6 6b) What is the probability of getting

someone who is left-eyed?37

100

Practice #4 The table gives the handedness and eyedness of a randomly selected group of 100 people.

.37

c) What is the probability of getting someone who is left-handed and is also left-eyed?

Right-Right-EyedEyed

Left-Left-EyedEyed

Right-Right-HandedHanded

57 31

Left-Left-HandedHanded

6 6

6100

Practice #4 The table gives the handedness and eyedness of a randomly selected group of 100 people.

.06

d) What is the probability of getting someone who is right-handed and is also right-eyed?

Right-Right-EyedEyed

Left-Left-EyedEyed

Right-Right-HandedHanded

57 31

Left-Left-HandedHanded

6 6

57100

Practice #4 The table gives the handedness and eyedness of a randomly selected group of 100 people.

.57

You Try!!

e)

f) 31100

.31

.8888100

Practice #5The chart shows favorite subjects of students based on their gender.

MathMath SciencSciencee

EnglisEnglishh

SSSS

MaleMale 46 42 13 25FemalFemalee

12 21 45 36

a) What is the probability that a randomly chosen student likes Social Studies the most?

61240

.25

MathMath SciencSciencee

EnglisEnglishh

SSSS

MaleMale 46 42 13 25FemalFemalee

12 21 45 36

b) What is the probability that a randomly chosen student is female?

Practice #5The chart shows favorite subjects of students based on their gender.

.475114240

MathMath SciencSciencee

EnglisEnglishh

SSSS

MaleMale 46 42 13 25FemalFemalee

12 21 45 36c) What is the probability that a

randomly chosen student both likes science and is a male?

Practice #5The chart shows favorite subjects of students based on their gender.

.17542240

MathMath SciencSciencee

EnglisEnglishh

SSSS

MaleMale 46 42 13 25FemalFemalee

12 21 45 36d) What is the probability that a

randomly chosen student likes social studies and is a female?

Practice #5The chart shows favorite subjects of students based on their gender.

.1536240

You Try!!

e)

f) 45240

.1875

.2458240