Pre-Calculus

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Suppose that the quarterly sales levels among health care
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 12 million dollars and a standard deviation of 1.1 million… read more
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Suppose that scores on a particular test are normally
Suppose that scores on a particular test are normally distributed with a mean of 110 and a standard deviation of 18. What is the minimum score needed to be in the top 10% of the scores on the test? Ca… read more
rajeevanpillai
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The Great West Mining Company has struck the mother lode in
The Great West Mining Company has struck the mother lode in their newly acquired gold field. They are modelling the weights of the gold nuggets they'll find over the next year using a normal distribut… read more
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CetaceaNow is a conservationist organization that monitors
CetaceaNow is a conservationist organization that monitors the health of whale and dolphin populations worldwide. As part of their work, they are modelling the lengths of blue whale calves that will b… read more
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We want to conduct a hypothesis test of the claim that for
We want to conduct a hypothesis test of the claim that for middle-aged adults the population mean of their cholesterol levels is less than 194.9. We choose a random sample of such levels. The sample h… read more
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The manufacturer of a fertilizer guarantees that, with the
The manufacturer of a fertilizer guarantees that, with the aid of the fertilizer, 75% of planted seeds will germinate. Suppose the manufacturer is correct. If 10 seeds planted with the fertilizer are … read more
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From experience, an airline knows that only 75% of the
From experience, an airline knows that only 75% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that at most 6 of them show … read more
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Coal is carried from a mine in West to a power plant in New
Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 55 tons of coal into each car. The actual weight… read more
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A biology researcher is studying the risk of extinction of a
A biology researcher is studying the risk of extinction of a rare tree species in a remote part of the Amazon. In the course of her study, the researcher models the trees' ages using a normal distribu… read more
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Not all visitors to a certain company's website are
Not all visitors to a certain company's website are customers or potential customers. In fact, the company's executives estimate that about 10% of all visitors to the website are looking for other web… read more
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A highway safety inspector, is concerned about the potential
Tom, a highway safety inspector, is concerned about the potential for accidents caused by boulders that fall down a sandstone cliff beside a main highway. As part of an accident simulator, Tom models … read more
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A TV executive is interested in the popularity of a
A TV executive is interested in the popularity of a particular cable TV show. She has been told that a whopping 65% of American households would be interested in tuning in to a new network version of … read more
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COLLEGE STATISTICS PROBLEM A community college Math
COLLEGE STATISTICS PROBLEMA community college Math instructor feels that the average age of community college students decreased since they started teaching 25 years ago. Looking up data from the year… read more
Kofi
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For a standardized psychology examination intended for
For a standardized psychology examination intended for psychology majors, the historical data show that scores have a mean of 515 and a standard deviation of 180. The grading process of this year's ex… read more
Sandhya
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Question 1 Assume that the weight loss first month
Question 1 Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform dis… read more
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Question 1: The data from your sample of 80 employees can be
Question 1: The data from your sample of 80 employees can be found on the tab labelled "Health Exam Results Data." The fasting total cholesterol measurement (mg/dL) is recorded as "cholesterol". Level… read more
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For John - math Sex Age Height Weight Cholesterol Female 17 64.3 114.8 269 Female 32
For John - math Sex Age Height Weight Cholesterol Female 17 64.3 114.8 269 Female 32 66.4 149.3 186 Female 25 62.3 107.8 272 Female 55 62.3 160.1 389 Female 27 59.6 127.1 103 Female 29 63.6 123.1 67 F… read more
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What is the mean annual snowfall during 49 randomly picked years?
Solve the problem. The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 94 inches, and a standard deviation of 14 inches. What is the probability that the … read more
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