A study was done regarding peoples text message usage For a

A study was done regarding people\'s text message usage. For a random selection, the probability of a male or a female using text messaging or not is given in the following table:

A person is selected at random.

a.) Find the probability the person is a male

b.) Find the probability the person uses texting

c.) Find the probability the person is female and does not use texting or is a male and does use texting

Solution

(a)

Either a person used text messaging or not. Since both events are mutually exclusive so the probability the person is a male is

P(male)=0.37+0.12=0.47

(b)

The probability the person uses texting is

P(texting)=0.37+0.33=0.70

(c)

The probability the person is female and does not use texting is

P(Female and not use texting)=0.18

and the probability that the persin is a male and does use texting is

P(male and use texting) = 0.37

Since both above functions are mutually exclusive so the probability the person is female and does not use texting or is a male and does use texting is

P(Female and not use texting or male and use texting)=0.37+0.18=0.55