The following probabilities are based on data collected from U.S. adults during the National Health Interview Survey 2005–2007. Individuals are placed into a weight category based on weight, height, gender and age.Underweight Healthy Weight Overweight (Not Obese) ObeseProbability 0.019 0.377 0.35 0.254Based on this data, what is the probability that a randomly selected U.S. adult weighs more than the healthy weight range? 0.0889 0.35 0.254 0.604Question 5Select one answer.10 pointsLet A and B be two disjoint events such that P(A) = 0.20 and P(B) = 0.60.What is P(A and B)? 0 0.12 0.68 0.80Question 6Select one answer.10 pointsIn 2012, researchers working with a very large population of health records found that 9.3% of all Americans had diabetes (source: National Diabetes Statistics Report, 2014). Suppose a medical researcher randomly selects two individuals from a large population.Let A represent the event “the first individual has diabetes.”Let B represent the event “the second individual has diabetes.”True or false? A and B are independent events. True FalseQuestion 7Select one answer.10 pointsAn engineering school reports that 55% of its students were male (M), 40% of its students were between the ages of 18 and 20 (A), and that 25% were both male and between the ages of 18 and 20.What is the probability of a random student being male or between the ages of 18 and 20? 0.22 0.25 0.70 0.95Question 8Select one answer.10 pointsAccording to the information that comes with a certain prescription drug, when taking this drug, there is a 20% chance of experiencing nausea (N) and a 50% chance of experiencing decreased sexual drive (D). The information also states that there is a 15% chance of experiencing both side effects.What is the probability of experiencing neither of the side effects? 0.10 0.40 0.45 0.70 0.85Question 9Select one answer.10 pointsAn engineering school reports that 55% of its students were male (M), 40% of its students were between the ages of 18 and 20 (A), and that 25% were both male and between the ages of 18 and 20.What is the probability of a random student being female between the ages of 18 and 20? Assume P(F) = P(not M). 0.15 0.16 0.30 0.40Question 10Select one answer.10 pointsIn a certain liberal arts college with about 10,000 students, 40% are males. If two students from this college are selected at random, what is the probability that they are both males? 0 0.16 0.80 0.64 0.25
Question
The following probabilities are based on data collected from U.S. adults during the National Health Interview Survey 2005–2007. Individuals are placed into a weight category based on weight, height, gender and age.Underweight Healthy Weight Overweight (Not Obese) ObeseProbability 0.019 0.377 0.35 0.254Based on this data, what is the probability that a randomly selected U.S. adult weighs more than the healthy weight range? 0.0889 0.35 0.254 0.604Question 5Select one answer.10 pointsLet A and B be two disjoint events such that P(A) = 0.20 and P(B) = 0.60.What is P(A and B)? 0 0.12 0.68 0.80Question 6Select one answer.10 pointsIn 2012, researchers working with a very large population of health records found that 9.3% of all Americans had diabetes (source: National Diabetes Statistics Report, 2014). Suppose a medical researcher randomly selects two individuals from a large population.Let A represent the event “the first individual has diabetes.”Let B represent the event “the second individual has diabetes.”True or false? A and B are independent events. True FalseQuestion 7Select one answer.10 pointsAn engineering school reports that 55% of its students were male (M), 40% of its students were between the ages of 18 and 20 (A), and that 25% were both male and between the ages of 18 and 20.What is the probability of a random student being male or between the ages of 18 and 20? 0.22 0.25 0.70 0.95Question 8Select one answer.10 pointsAccording to the information that comes with a certain prescription drug, when taking this drug, there is a 20% chance of experiencing nausea (N) and a 50% chance of experiencing decreased sexual drive (D). The information also states that there is a 15% chance of experiencing both side effects.What is the probability of experiencing neither of the side effects? 0.10 0.40 0.45 0.70 0.85Question 9Select one answer.10 pointsAn engineering school reports that 55% of its students were male (M), 40% of its students were between the ages of 18 and 20 (A), and that 25% were both male and between the ages of 18 and 20.What is the probability of a random student being female between the ages of 18 and 20? Assume P(F) = P(not M). 0.15 0.16 0.30 0.40Question 10Select one answer.10 pointsIn a certain liberal arts college with about 10,000 students, 40% are males. If two students from this college are selected at random, what is the probability that they are both males? 0 0.16 0.80 0.64 0.25
Solution
Sure, I can help with that. Here are the answers to your questions:
Question 4: The probability that a randomly selected U.S. adult weighs more than the healthy weight range is the sum of the probabilities of being Overweight (Not Obese) and Obese. So, 0.35 + 0.254 = 0.604.
Question 5: If A and B are two disjoint events, they cannot occur at the same time. Therefore, P(A and B) = 0.
Question 6: True. If the selection of the individuals is random, the event of the first individual having diabetes is independent of the event of the second individual having diabetes.
Question 7: The probability of a random student being male or between the ages of 18 and 20 is P(M) + P(A) - P(M and A) = 0.55 + 0.40 - 0.25 = 0.70.
Question 8: The probability of experiencing neither of the side effects is 1 - P(N or D) = 1 - [P(N) + P(D) - P(N and D)] = 1 - [0.20 + 0.50 - 0.15] = 0.45.
Question 9: The probability of a random student being female between the ages of 18 and 20 is P(A) - P(M and A) = 0.40 - 0.25 = 0.15.
Question 10: The probability that two randomly selected students are both males is P(M)^2 = (0.40)^2 = 0.16.
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