- 41. A business fly airplane has four motors. For an airplane in trip to land

securely, in any event two motors ought to be in working condition. Every motor has a free unwavering quality of p 92%.

a. What is the likelihood that an airplane in flight can land securely?

b. On the off chance that the likelihood of landing securely should be in any event 99.5%, what is the base incentive for p? Rehash the inquiry for likelihood of landing securely to

be 99.9%.

c. In the event that the unwavering quality can't be improved past 92% yet the quantity of

motors in a plane can be expanded, what is the base number of

motors that would accomplish in any event 99.5% likelihood of landing securely?

Rehash for 99.9% likelihood.

d

A PC research center in a school has 33 PCs. Every one of the 33 PCs has 90% dependability. Considering 10% of the PCs to be down, an educator

indicates an enlistment roof of 30 for his group. Accept that a class of 30 understudies is

taken into the lab.

a. What is the likelihood that every one of the 30 understudies will get a PC in

working condition?

b. The educator is astonished to see the low worth of the response to (a) and

chooses to improve it to at any rate 95% by doing one of the accompanying:

I. Diminishing the enlistment roof.

ii. Expanding the quantity of PCs in the lab.

iii. Expanding the unwavering quality of the multitude of PCs.

To help the educator, discover what the increment or decline ought to be for each of

the three other options.

The time it takes a global phone administrator to put an abroad call is ordinarily disseminated with mean 45 seconds and standard deviation 10 seconds.

a. What is the likelihood that my call will go through in under 1 moment?

b. What is the likelihood that I will overcome in under 40 seconds?

c. What is the likelihood that I should stand by over 70 seconds for my call to go thro

A MBA graduate is going after nine positions, and accepts that she has in each

of the nine cases a consistent and autonomous 0.48 likelihood of getting an offer.

a. What is the likelihood that she will have at any rate three offers?

b. In the event that she needs to be 95% sure of having at any rate three offers, the number of

more positions would it be advisable for her to apply for? (Expect every one of these extra applications will likewise have a similar likelihood of progress.)

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c. On the off chance that there are close to the first nine positions that she can apply for,

what worth of likelihood of accomplishment would give her 95% certainty of at

least three offers?