Mathematics, 15.04.2020 04:17, mkn3347
A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: Sample Service Life (hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470 If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control? Multiple Choice sample 2 sample 3 both samples 2 and 3 all samples are in control
Answers: 1
Mathematics, 21.06.2019 16:30, monica1400
The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?
Answers: 3
Mathematics, 21.06.2019 17:30, theeflyguy5
Student price tickets to a movie are $1 and non student tickets are $2 . 350 tickets are sold and the total amount made is $450. there were 250 student tickets sold . true or false .
Answers: 1
Mathematics, 21.06.2019 21:30, bakoeboo
The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?
Answers: 3
A design engineer wants to construct a sample mean chart for controlling the service life of a halog...
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