Mathematics, 15.04.2020 17:22, royalty67
A particular automatic sprinkler system for high-rise apartment buildings, office buildings and hotels has two different types of activation devices for each sprinkler head. One type has a reliability of .91 (i. e. the probability that it will activate the sprinkler when it should is 91). The other type, which operates independently of the first type, has a reliability of 87. Suppose a serious fire starts near a particular sprinkler head.
a. What is the probability that the sprinkler head will be activated?
b. What is the probability that the sprinkler head will not be activated?
c. What is the probability that both activation devices will work properly?
d. What is the probability that only the device with reliability.91 will work properly?
Answers: 3
Mathematics, 21.06.2019 17:50, domiyisthom
On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.
Answers: 2
Mathematics, 21.06.2019 18:30, tyler5016
The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125
Answers: 2
A particular automatic sprinkler system for high-rise apartment buildings, office buildings and hote...
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