Probability

Questions & Answers

11. In a large population, 60% of the people have been vaccinated. If 4 people are randomly selected, what is the probability that at least one of them has been vaccinated? Give your answer as a decimal to 4 places.


2. Of fifty students surveyed, twenty-five played volleyball thirty-three played basketball and four played neither sport. a) How many students played both sports? b.) Complete the Venn-Diagram. c) Find the probabilities: i) P ( play both sports) ii) P (play Volleyball only) (iii) P (play neither) iv) P (play Voleyball or basketball)


a) add columns /rows to field totals for each category. b) In selecting person at random, what is the probability that they are.... i) P (male smoker) ii) P (smoker) iii) P (Non-Smoker) iv) P (female Non-Sunder


Consider the following survey of customer's purchases at a coffee shop. Suppose all selections are made randomly, with replacement. Rewrite each problem with the proper notation, then find the desired probability. a. Find the probability of selecting a single customer who orders decaf coffee. b. Find the probability of selecting a single customer who orders regular coffee or a pastry. c. Find the probability of selecting a single customer who orders both regular coffee and a pastry. d. Find the probability of selecting a single person who had no pastry, given that they ordered a decaf coffee. e. Find the probability of selecting a single person who order decaf coffee, given that they had a pastry. f. Find the probability of selecting two people (with replacement) who both ordered decaf coffee. g. Find the probability of selecting two people (with replacement) where one ordered a pastry and one did not.


3. A casino owner designs a game in which a regular deck of cards is shuffled and a gambler is allowed to select any card at random. If he selects an ace he wins $10. If he selects a face card (i.e. J, Q, or K) he wins $5. If he selects any other card he wins $1. (a) Assuming the casino owner wants at least to break even, what is the minimum value he should charge the gambler to play this game? (b) What is the standard deviation for the gambler's winnings? (c) What is the probability that the gambler wins more than $1? (d) Suppose a gambler plays the game twice. What is the probability that his total winnings exceed $2?


1-A group of people were asked if they had run a red light in the last year. 368 responded "yes", and 168 responded "no". Find the probability that if a person is chosen at random, they have run a red light in the last year. Give your answer as a fraction or decimal accurate to at least 3 decimal places


4. In a jail cell, there are 5 Democrats and 6 Republicans. Four of these people will be randomly chosen for early release. What is the probability that a group consisting of 2 Democrats and 2 Republicans will be chosen for early release?


What is the empirical probability that a randomly selected superhero will have super strength?


3. The executive of the Manitoba Association of Mathematics Teachers consists of 3 women and 2 men. In how many ways can a president and secretary be chosen if: (a) the president must be female and the secretary male? (b) The president must be male and the secretary female? (c) The president and secretary are of opposite sex?


9. A couple plans to have three children. What is the probability that a) they have all boys? b) they have at least one girl?


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