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# The number of pages printed before replacing the cartridge in a laser printer is normally distributed_Answer

The number of pages printed before replacing the cartridge in a laser printer is normally distributed_Answer

The number of pages printed before replacing the cartridge in a laser printer is normally distributed_Answer

The number of pages printed before replacing the cartridge in a laser printer is normally distributed_Answer

The number of pages printed before replacing the cartridge in a laser printer is normally distributed_Answer

Problem 8.51 page 279

The number of pages printed before replacing the cartridge in a laser printer is normally distributed with a mean of 11,500 pages and a standard deviation of 800 pages. A new cartridge has just been installed.

A.) What is the probability that the printer produces more than 12,000 pages before this cartridge needs to be replaced?
B.) What is the probability that the printer produces fewer than 10,000 pages?

Problem 8.65 page 280

Every day a bakery prepares its famous marble rye. A statistically savvy customer determined that daily demand is normally distributed with a mean of 850 and a stand. deviation of 90. How many loaves should the bakery make it if it wanst the probability of runnin short in ant day ti be no more than 30 % ?

Problem 9.17 page 314

An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are independently and normally distributed with a mean of 117 cm and a standard deviation of 5.2 cm.

A. Find the probability that one selected subcomponent is longer than 120 cm.

Probability =

B. Find the probability that if 4 subcomponents are randomly selected, their mean length exceeds 120 cm.

Probability =

C. Find the probability that if 4 subcomponents are randomly selected, all 4 have lengths that exceed 120 cm.

Probability =

Problem 9.43 page 321
An accounting professor claims that one quarter of undergraduate business students major in accounting. If we assume this is true, what is the probability that in a random sample of 1200 undergraduate business students, 336 or more will major in accounting?

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