Mathematics, 05.04.2021 14:00 riplilsnupe023
A certain brand of flood lamps has a lifetime that is normally distributed with a mean
of 3,750 hours and a standard deviation of 300 hours.
(a) What proportion of these lamps will last for at least 4,000 hours?
(b) What proportion of these lamps will last between 3,600 and 4,000 hours?
(c) What proportion of these lamps will last less than 3,800?
Answers: 2
Mathematics, 20.06.2019 18:04
George is 187 cm tall. his son, ralph, is 142 cm tall. who casts the longer shadow. george when the sun is 65° above the horizon, or ralph when the sun is 56° above the horizon? how much longer? (nearest centimeter)
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Mathematics, 21.06.2019 20:30
Kai walked one and two-thirds of a mile on saturday and four and one-sixth of a mile on sunday. how many miles did kai walk?
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A certain brand of flood lamps has a lifetime that is normally distributed with a mean
of 3,750 hou...
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