Assume that the fight time for US Airways night 1267 from Philadelphia to Dallas

Question

Assume that the fight time for US Airways night 1267 from Philadelphia to Dallas follows the uniform probability distribution between 210 and 250 minutes. What is the probability that a randomly selected night will take more than 225 minutes? 0195 0361 0, 625 0700 Any normally distributed values can be standardized with z-scores. True False According to the MIT Airline Data Project American Airlines controlled 15.5% of the domestic market in 2010. A random passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that 20, 21, 22, 23, 24 or 25 passengers from this were on American Airline Flights? 0.2534 0.4225 0.5310 0.6810 A survey conducted in 2011 asked employed adults tom age 25 to 70 if they plan to keep a foot in the working world after retirement. Thirty-three percent of the respondents answered "very likely". A random sample of 75 adult from this age group was asked the same question. Using the normal approximation to the binomial distribution, what is the probability that 21 or adults tom his sample would very likely plan to keep a foot in the working world after retirement? 0.1075 0.2119 0.3192 0.4721

Explanation / Answer

Question 1

P(210<X<250) = 1

P(X>225) = (250-225)/(250-210) = 25/40 = 0.625

Question 2

True

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