Mathematics, 31.03.2020 03:41 bricakes3
1. Industrial lightbulbs should have a mean life length acceptable to potential users and a relatively small variation in life length. Large variations below the mean annoy customers; large variations above the mean reduce replacement sales. A random sample of 20 bulbs produced by a particular manufacturer produced the following lengths of life in hours: 2100, 2302, 1951, 2067, 2415, 1883, 2101, 2046, 2378, 2019, 1924, 2183, 1977, 2492, 2286, 2401, 2046, 2161, 2253, 1827. a) Calculate the mean, variance and standard deviation of the life length using the standard unbiased estimator. b) Calculate the 95% confidence interval for the mean and the variance estimates.
Answers: 2
Mathematics, 21.06.2019 17:20
Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem
Answers: 3
Mathematics, 21.06.2019 19:00
Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00
Answers: 1
Mathematics, 21.06.2019 20:00
Karen will divide her garden into equal parts. she will plant corn in 8/12 of the garden. what is the lowest number of parts she can divide her garden into?
Answers: 1
Mathematics, 21.06.2019 23:00
Rob filled 5 fewer plastic boxes with football cards than basketball cards. he filled 11 boxes with basketball cards.
Answers: 1
1. Industrial lightbulbs should have a mean life length acceptable to potential users and a relative...
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