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An experiment consists of tossing a nickel, a dime and a quarter. Of interest is the side the coin lands on.

  • List the sample space.
  • Let A be the event that there are at least two tails. Find P(A) .
  • Let B be the event that the first and second tosses land on heads. Are the events A and B mutually exclusive? Explain your answer in 1 - 3 complete sentences, including justification.
  • { ( HHH ) , ( HHT ) , ( HTH ) , ( HTT ) , ( THH ) , ( THT ) , ( TTH ) , ( TTT ) } size 12{ lbrace \( ital "HHH" \) , \( ital "HHT" \) , \( ital "HTH" \) , \( ital "HTT" \) , \( ital "THH" \) , \( ital "THT" \) , \( ital "TTH" \) , \( ital "TTT" \) rbrace } {}
  • 4 8 size 12{ { { size 8{4} } over { size 8{8} } } } {}
  • Yes

Consider the following scenario:

  • Let P(C) = 0.4
  • Let P(D) = 0.5
  • Let P(C|D) = 0.6

  • Find P(C AND D) .
  • Are C and D mutually exclusive? Why or why not?
  • Are C and D independent events? Why or why not?
  • Find P(C OR D) .
  • Find P(D|C) .

E size 12{E} {} and F size 12{F} {} mutually exclusive events. P ( E ) = 0 . 4 size 12{P \( E \) =0 "." 4} {} ; P ( F ) = 0 . 5 size 12{P \( F \) =0 "." 5} {} . Find P ( E F ) size 12{P \( E \lline F \) } {} .

0

J size 12{J} {} and K size 12{K} {} are independent events. P(J | K) = 0.3 .Find P ( J ) size 12{P \( J \) } {} .

U size 12{U} {} and V size 12{V} {} are mutually exclusive events. P ( U ) = 0 . 26 size 12{P \( U \) =0 "." "26"} {} ; P ( V ) = 0 . 37 size 12{P \( V \) =0 "." "37"} {} . Find:

  • P(U AND V) =
  • P(U | V) =
  • P(U OR V) =
  • 0
  • 0
  • 0.63

Q size 12{Q} {} and R size 12{R} {} are independent events. P(Q) = 0.4 ; P(Q AND R) = 0.1 . Find P(R) .

Y size 12{Y} {} and Z size 12{Z} {} are independent events.

  • Rewrite the basic Addition Rule P(Y OR Z) = P(Y) + P(Z) - P(Y AND Z) using the information that Y and Z are independent events.
  • Use the rewritten rule to find P(Z) if P(Y OR Z) = 0.71 and P(Y) = 0.42 .

  • 0.5

G size 12{G} {} and H size 12{H} {} are mutually exclusive events. P ( G ) = 0 . 5 size 12{P \( G \) =0 "." 5} {} ; P ( H ) = 0 . 3 size 12{P \( H \) =0 "." 3} {}

  • Explain why the following statement MUST be false: P ( H G ) = 0 . 4 size 12{P \( H \lline G \) =0 "." 4} {} .
  • Find: P(H OR G) .
  • Are G size 12{G} {} and H size 12{H} {} independent or dependent events? Explain in a complete sentence.

The following are real data from Santa Clara County, CA. As of a certain time, there had been a total of 3059 documented cases of AIDS in the county. They were grouped into the following categories ( Source: Santa Clara County Public H.D. ):

* includes homosexual/bisexual IV drug users
Homosexual/Bisexual IV Drug User* Heterosexual Contact Other Totals
Female 0 70 136 49 ____
Male 2146 463 60 135 ____
Totals ____ ____ ____ ____ ____

Suppose one of the persons with AIDS in Santa Clara County is randomly selected. Compute the following:

  • P(person is female) =
  • P(person has a risk factor Heterosexual Contact) =
  • P(person is female OR has a risk factor of IV Drug User) =
  • P(person is female AND has a risk factor of Homosexual/Bisexual) =
  • P(person is male AND has a risk factor of IV Drug User) =
  • P(female GIVEN person got the disease from heterosexual contact) =
  • Construct a Venn Diagram. Make one group females and the other group heterosexual contact.

The completed contingency table is as follows:

* includes homosexual/bisexual IV drug users
Homosexual/Bisexual IV Drug User* Heterosexual Contact Other Totals
Female 0 70 136 49 255
Male 2146 463 60 135 2804
Totals 2146 533 196 184 3059
  • 255 3059
  • 196 3059
  • 718 3059 size 12{ { { size 8{"718"} } over { size 8{"3059"} } } } {}
  • 0
  • 463 3059
  • 136 196

Solve these questions using probability rules. Do NOT use the contingency table above. 3059 cases of AIDS had been reported in Santa Clara County, CA, through a certain date. Those cases will be our population. Of those cases, 6.4% obtained the disease through heterosexual contact and 7.4% are female. Out of the females with the disease, 53.3% got the disease from heterosexual contact.

  • P(person is female) =
  • P(person obtained the disease through heterosexual contact) =
  • P(female GIVEN person got the disease from heterosexual contact) =
  • Construct a Venn Diagram. Make one group females and the other group heterosexual contact. Fill in all values as probabilities.

Questions & Answers

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Source:  OpenStax, Collaborative statistics using spreadsheets. OpenStax CNX. Jan 05, 2016 Download for free at http://legacy.cnx.org/content/col11521/1.23
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