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Standard deviation

Please use MINITAB to solve or explain how I can use MINITAB to solve. 7. Assume that the midterm's scores X are normally distributed. Let X have a mean of 72 and a standard deviation of 12. Then answer the following three questions: a. What is the probability of obtaining a score at least 90? b. What is the probability of obtaining a score at most 75? c. What is the probability of obtaining a score between 60 and 79?

Subject:

Statistics

Topic:

All Topics

Posting ID:

3633

OTA ID:

103058

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Probability - probability tree

6. I am thinking about buying a used car. To make an informed decision, I look up the records of used cars in an auto magazine, and find that, unfortunately, 30% have defective transmissions. To get more information on the particular used car, I hire a mechanic who can make a guess on the basis of a quick drive around the block. Of course, he isn't always right; but he does have an excellent record: Of all the faulty cars he has examined in the past he correctly pronounced 90% "defective"; in other words, he wrongly pronounced only 10% "OK." He has almost as good a record in judging good cars: He has correctly pronounced 80% "OK," while he wrongly pronounced only 20% "defective." (Please not... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

3634

OTA ID:

103139

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Probability

In Washington, DC, 30% of the families have a MasterCard, 20% have an American Express card, and 25% have a Visa card. 8% of the families have both a MasterCard and an American Express card. 12% have both a Visa card and a MasterCard. 6% have both an American Express card and a Visa Card. a. What is the probability of selecting a family that has either a Visa card or an American Express card? b. Given that a family has a MasterCard, what is the probability that it has a Visa card? c. Given that a family has a Visa card, what is the probability that it has a MasterCard? d. Is possession of an American Express card mutually exclusive of possession of a Visa card? Explain your answer. ... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

3635

OTA ID:

103139

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Frequency Distribution - Histogram

The Air Transport Association of America published figures on the busiest airports in the United States. The following frequency distribution has been constructed from these figures for the year 2000. NUMBER OF PASSENGERS ARRIVING AND DEPARTING (MILLIONS) NUMBER OF AIRPORTS 20 - under 30 8 30 - under 40 7 40 - under 50 1 50 - under 60 0 60 - under 70 3 70 - under 80 1 a. Calculate the mean and mode of number of passengers arriving and departing using data presented. b.Calculate the variance and the standard deviation. c. Draw histogram and give on those data. Comment on effectiveness of each chart.

Subject:

Statistics

Topic:

All Topics

Posting ID:

3636

OTA ID:

103058

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Probability - expected number and the standard deviation

The following data are the result of a historical study of the number of flaws found in a porcelain cup produced by a manufacturing firm. Use these data and the associated probabilities to compute the expected number and the standard deviation of flaws. Flaws Probability 0 0.461 1 0.285 2 0.129 3 0.087 4 0.038

Subject:

Statistics

Topic:

All Topics

Posting ID:

3637

OTA ID:

102799

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