3. There are 20 black cell phones and 30 white cell phones in a store. An...
25) A 20% of college of engineering students prefer white cell phones. What is the approximate probability that among 1000 cell phone users: a) Between 170 & 185 inclusive use white cell phone. b) At least 210 users use white phone. c) Exactly 260 users prefer white phone. d) What is the value such that probability that the number of white cell phone users exceed the value is 0.01?
In a survey of consumers aged 12 and older, respondents were asked how many cell phones were in use by the household. (No two respondents were from the same household.) Among the respondents, 207 answered "none," 294 said "one," 358 said "two,"150 said "three," and 56 responded with four or more. A survey respondent is selected at random. Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to have...
Typed answers are preferrable over handwritten :) A jar contains 6 white beads and 3 black beads. Beads are chosen randomly from the jar one at a time until the third time a black bead turns up. a. Suppose that each bead is replaced before the next is chosen. How many beads should you expect to be chosen in the course of the experiment? [5] b. Suppose that if a bead is white, it is not replaced before the next...
Twenty percent (20%) of a certain type of cell phones are returned for repairs while under warranty. (i) If a company purchases ten of these cell phones for their employees, what is the probability that exactly two of them will need repairs while under warranty? [6 marks] (ii) Of the 10 cell phones purchased by the company, how many would you expect to be returned for repairs while under warranty? [1 mark] (iii) Suppose five hundred (500) cell phones were...
Samsung, Nokia, or Apple? Samsung is by far the market leader in bestselling cell phones worldwide. It commands 25.7% of the market. Nokia's share is 13.8%, Apple is 6.7%, LG is 4%. Out of a random sample of 30 customers at the phone store, what is the probability that exactly half will have Samsungs?
ma survey of consumers aged 12 and older, respondents were asked how many cell phones were in use by the household. (No two respondents were from the same household. Among the respondents, 211 answered "none." 286 said "one" 369 said "two," 144 said "three,' and 65 responded with four or more. A survey respondent is selected at random. Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to have...
Two bags contain a number of balls. Bag A contains 4 white and 3 black balls and bag B contains 3 whit and 5 black balls. A ball is chosen at random from bag A and placed into bag B i). Given that the first ball was black, what is the probability that a second ball drawn from bag A will be white? (1 mark) Given no knowledge of the color of the first ball, what is the probability that...
In a survey of consumers aged 12 and older, respondents were asked how many cell phones were in use by the household. (No two respondents were from the same household.) Among the respondents, 212 answered "none," 288 said "one," 371 said "two," 148 said "three," and 82 responded with four or more. A survey respondent is selected at random. Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to...
Two balls are chosen from an urn without replacement. 3 are black and 4 are white. Find a) the probability that both of the balls are the same color b) given that at least one of the balls is white, what is probability that the other ball is white?
2(15)(a) An urn contains 4 white and 4 black balls. We randomly choose 4 balls. If 2 of them are white and 2 are black, we stop. If not, we replace the balls in the urn and again randomly select 4 balls. This continues until exactly 2 of the 4 chosen are white. What is the probability that we shall maken selections? (b)Compute E[x2] for a Poisson random variable X.
> Answer in b) is correct but should say 50 C 10 in the numerator
Steinar Bjornsson Thu, Jan 13, 2022 3:10 AM