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5.4. The probability density function of X, the lifetime of a certain type of electronic device (measured in hours), is given by
10
x > 10
f)
0
10
a. Find P{X> 20}.
b. What is the cumulative distribution function of X?
c. What is the probability that of 6 such types of devices, at least 3 will function for at least 15 hours? What assumptions are you making?
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Transcribed Image Text:5.4. The probability density function of X, the lifetime of a certain type of electronic device (measured in hours), is given by 10 x > 10 f) 0 10 a. Find P{X> 20}. b. What is the cumulative distribution function of X? c. What is the probability that of 6 such types of devices, at least 3 will function for at least 15 hours? What assumptions are you making?
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