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QUESTION

Jan 26, 2017

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List three methods of assigning probabilities. (Select all that apply.)histogram intuitionguessing equally likely outcomes relative frequencycumulative frequency

Show My Work (Optional)  You can submit show my work an unlimited number of times.          2.4/4 points3/10 Submissions Used |  Previous AnswersBBBasicStat7 5.1.023.Ask Your TeacherMy Notes Question PartPoints          John runs a computer software store. Yesterday he counted 127 people who walked by the store, 53 of whom came into the store. Of the 53, only 20 bought something in the store.(a) Estimate the probability that a person who walks by the store will enter the store. (Round your answer to two decimal places.)
0.42
0.42

(b) Estimate the probability that a person who walks into the store will buy something. (Round your answer to two decimal places.)
0.38
0.38

(c) Estimate the probability that a person who walks by the store will come in and buy something. (Round your answer to two decimal places.)
0.16
0.16

(d) Estimate the probability that a person who comes into the store will buy nothing. (Round your answer to two decimal places.)
0.62
0.62
- Show My Work (Optional)  You can submit show my work an unlimited number of times.         3.5/5 points1/10 Submissions Used |  Previous AnswersBBBasicStat7 5.2.016.Ask Your TeacherMy Notes  A national park is famous for its beautiful desert landscape and its many natural rock formations. The following table is based on information gathered by a park ranger of all rock formations of at least 3 feet. The height of the rock formation is rounded to the nearest foot.Height of rock formation, feet3–910–2930–4950–7475 and higherNumber of rock formations in park1189522319For a rock formation chosen at random from this park, use the preceding information to estimate the probability that the height of the rock formation is as follows. (Round your answers to two decimal places.)(a) 3 to 9 feet
  0.43
  0.43
  
  (b) 30 feet or taller
  0.23
  0.23
  
  (c) 3 to 49 feet
  0.85
  0.85
  
  (d) 10 to 74 feet
  0.54
  0.54
  
  (e) 75 feet or taller
  0.03
  0.03
  - Show My Work (Optional)  You can submit show my work an unlimited number of times.         4.4/4 points2/10 Submissions Used |  Previous AnswersBBBasicStat7 5.2.020.Ask Your TeacherMy Notes  You roll two fair dice, a green one and a red one.(a) What is the probability of getting a sum of 7? (Enter your answer as a fraction.)
    1/6
    1/6
    
    (b) What is the probability of getting a sum of 11? (Enter your answer as a fraction.)
    1/18
    1/18
    
    (c) What is the probability of getting a sum of 7 or 11? (Enter your answer as a fraction.)
    2/9
    2/9
    
    Are these outcomes mutually exclusive?
    YesNo       5.4/4 points2/10 Submissions Used |  Previous AnswersBBBasicStat7 5.2.022.Ask Your TeacherMy Notes Question PartPoints          You draw two cards from a standard deck of 52 cards without replacing the first one before drawing the second.(a) Are the outcomes on the two cards independent? Why?Yes. The events can occur together.No. The events cannot occur together.     No. The probability of drawing a specific second card depends on the identity of the first card.Yes. The probability of drawing a specific second card is the same regardless of the identity of the first drawn card.
    (b) Find P(3 on 1st card and 10 on 2nd). (Enter your answer as a fraction.)
    4/663
    4/663
    
    (c) Find P(10 on 1st card and 3 on 2nd). (Enter your answer as a fraction.)
    4/663
    4/663
    
    (d) Find the probability of drawing a 10 and a 3 in either order. (Enter your answer as a fraction.)
    8/663
    8/663
       6.1/2 points3/10 Submissions Used |  Previous AnswersAsk Your TeacherMy Notes Question PartPoints      Based on data from a statistical abstract, only about 10% of senior citizens (65 years old or older) get the flu each year. However, of the people who are under the age of 65 years old, about 23% get the flu each year. In the general population, there are 18% senior citizens (65 years old or older). (Round your answers to three decimal places.)(a) What is the probability that a person selected at random from the general population is senior citizen who will get the flu this season?
    (b) What is the probability that a person selected at random from the general population is a person under the age of 65 who will get the flu this year?
    - Show My Work (Optional) You can submit show my work an unlimited number of times. 7.0/4 points1/10 Submissions Used | Previous AnswersAsk Your TeacherMy Notes Question PartPoints The state medical school has discovered a new test for tuberculosis. (If the test indicates a person has tuberculosis, the test is positive.) Experimentation has shown that the probability of a positive test is 0.83, given that a person has tuberculosis. The probability is 0.07 that the test registers positive, given that the person does not have tuberculosis. Assume that in the general population, the probability that a person has tuberculosis is 0.03. Based on this information, answer the following questions: (Enter your answers to four decimal places.)(a) What is the probability that a person chosen at random will have tuberculosis and have a positive test?
      (b) What is the probability that a person chosen at random will not have tuberculosis and have a positive test?
      (c) What is the probability that a person chosen at random will have a positive test?
      (d) What is the probability that a person with a positive test actually has tuberculosis?
      (Is this lower than you would have expected?)
      - Show My Work (Optional) You can submit show my work an unlimited number of times.