# Question 4.14: Refer to Example 4.13. The yield of a certain run has a z-sc...

Refer to Example 4.13. The yield of a certain run has a $z$-score of -1.4. Find the yield in the original units of grams.

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Question: 4.5

## Refer to Example 4.4. What is the probability that more than 2 of the 14 vehicles require warranty repairs? ...

Let X represent the number of invoices in the samp...
Question: 4.4

## Of all the new vehicles of a cet1ain model that are sold, 20% require repairs to be done under warranty during the first year of service. A particular dealership sells 14 such vehicles. What is the probability that fewer than five of them require warranty repairs? ...

Let X represent the number of vehicles that requir...
Question: 4.34

## The number of hits on a website follows a Poisson distribution, with a mean of 27 hits per hour. Find the probability that there will be 90 or more hits in three hours. ...

Let X denote the number of hits on the website in ...
Question: 4.33

## If a fair coin is tossed 100 times, use the normal curve to approximate the probability that the number of heads is between 45 and 55 exclusive. ...

This situation is illustrated in Figure 4.21. Let ...
Question: 4.32

## If a fair coin is tossed 100 times, use the normal curve to approximate the probability that the number of heads is between 45 and 55 inclusive. ...

This situation is illustrated in Figure 4.20.Let X...
Question: 4.31

## At a large university, the mean age of the students is 22.3 years, and the standard deviation is 4 years. A random sample of 64 students is drawn. What is the probability that the average age of these students is greater than 23 years? ...

Let $X_1 .... X_{64}$ be the ages of ...
Question: 4.30

## Let X denote the number of flaws in a 1 in. length of copper wire. The probability mass function of X is presented in the following table. ...

The population mean number of flaws is μ = 0.66, a...
Question: 4.20

## Refer to Example 4.19. Find the 40th percentile of battery lifetimes. ...

From the z table, the closest area to 0.4000 is 0....
Question: 4.19