Mathematics, 19.11.2019 06:31 peno211
Amanufacturing plant uses light bulbs whose life spans are normally distributed, with mean and standard deviation equal to 500 and 50 hours, respectively. in order to minimize the number of bulbs that burn out during operating hours, all the bulbs are replaced after a given period of operation. how often (in hr) should the bulbs be replaced if we wish no more than 2% of the bulbs to burn out between replacement periods? (round your answer to two decimal places.)
Answers: 2
Mathematics, 21.06.2019 17:00
The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left
Answers: 1
Mathematics, 21.06.2019 21:00
An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.
Answers: 1
Mathematics, 21.06.2019 21:10
Aplane intersects a pris paralel to the base of the prism. the cross section is a polygon wth eight sides. how many sides does the base of the prism have? a. 10 b. 8 c. 7 d. 9
Answers: 1
Mathematics, 21.06.2019 21:40
Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.
Answers: 3
Amanufacturing plant uses light bulbs whose life spans are normally distributed, with mean and stand...
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