Mathematics, 22.04.2020 22:17 kcceff4085
Butterflies: • Alice, Bob, and Charlotte are looking for butterflies. They look in three separate parts of a field, so that their probabilities of success do not affect each other. • Alice finds 1 butterfly with probability 17%, and otherwise does not find one. • Bob finds 1 butterfly with probability 25%, and otherwise does not find one. • Charlotte finds 1 butterfly with probability 45%, and otherwise does not find one. Let X be the number of butterflies that they catch altogether. A) Find the expected value of X. B) Write X as the sum of three indicator random variables, X1,X2,X3 that indicate whether Alice, Bob, Charlotte (respectively) found a butterfly. Then X=X1+X2+X3. Find the expected value of X by finding the expected value of the sum of the indicator random variables.
Answers: 2
Mathematics, 21.06.2019 15:00
The heaviest 16% of all men in weight weigh more than how many pounds ?
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Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500
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Mathematics, 21.06.2019 22:00
Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.
Answers: 1
Mathematics, 21.06.2019 22:00
Harry and jay are both flying on the same plane with an airline that randomly assigns seats to passengers. of the 182 total seats on the plane, 62 are window seats, 58 are middle seats, and the rest are aisle seats. what is the approximate probability that both harry and jay will be assigned aisle seats on the same plane? a. 11.48% b. 3.3% c. 2.08% d. 26.26%
Answers: 3
Butterflies: • Alice, Bob, and Charlotte are looking for butterflies. They look in three separate pa...
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