The principle of redundancy is used when system reliability is improved through redundant or backup components. assume that a student's alarm clock has a 6.8% daily failure rate. a. what is the probability that the student's alarm clock will not work on the morning of an important final exam? nothing (round to three decimal places as needed.) b. if the student has two such alarm clocks, what is the probability that they both fail on the morning of an important final exam? nothing (round to five decimal places as needed.) c. what is the probability of not being awakened if the student uses three independent alarm clocks? nothing (round to five decimal places as needed.) d. do the second and third alarm clocks result in greatly improved reliability? a. no, because total malfunction would still not be unlikely. b. no, because the malfunction of both is equally or more likely than the malfunction of one. c. yes, because total malfunction would not be impossible, but it would be unlikely. d. yes, because you can always be certain that at least one alarm clock will work.

Step-by-step explanation:

let X be the random variable for number of times the clock fails .

X is Poisson with average = 6.8% = 0.0068

PDF of x = e^(-0.0068) 0.0068^x/x!

a) The probability that the​ student's alarm clock will not work on the morning of an important final​ exam = P(X=0) = 0.00675

b) If the student has two such alarm​ clocks,  the probability that they both fail on the morning of an important final​ exam:

Since both clocks are  independent prob for both failing is

P(x1 fails) *P(x2 fails) = 0.00675(0.00675) = 0.000455625

c) the probability of not being awakened if the student uses three independent alarm​ clocks = Prob for all 3 fails = 0.00675^3

= 0.00000307546

d) Yes. Because all three fail probability is almost zero.

D. ​Yes, because you can always be certain that at least one alarm clock will work.

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step-by-step explanation:

to find the unit price, we must figure out the cost of one item (in this case one dish towel).   to do this, we divide the total price ($7.92) by the number of items bought (for this problem it is 8, because there are eight dish towels in one pack).  

$7.92/8 = $0.99

therefore, the unit price, or the price of one dish towel, is $0.99.

hope this !