Pre-Calculus

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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
rajeevanpillai
Master's Degree
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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
rajeevanpillai
Master's Degree
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According to her doctor, Mrs. Brown's cholesterol level is
According to her doctor, Mrs. Brown's cholesterol level is higher than only 15% of the females aged 50 and over. The cholesterol levels among females aged 50 and over are approximately normally distri… read more
rajeevanpillai
Master's Degree
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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
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Master's Degree
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A population of values has a normal distribution with μ =
A population of values has a normal distribution with μ = 212.5 and σ = 93.1 . A random sample of size n = 30 is drawn.Find the probability that a single randomly selected value is between 205.7 and 2… read more
rajeevanpillai
Master's Degree
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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
Tom
Master's Degree
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We want to conduct a hypothesis test of the claim that the
We want to conduct a hypothesis test of the claim that the population mean reading speed of second graders is different from 28.6 words per minute. So, we choose a random sample of students' reading s… read more
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Master's Degree
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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
rajeevanpillai
Master's Degree
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A manufacturer knows that their items have a normally
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11 years, and standard deviation of 2.2 years.If 25 items are picked at random, 4% of the time their mean lif… read more
Scott
Master's Degree
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A normal distributed population has parameters μ = 243.2 and
A normal distributed population has parameters μ = 243.2 and σ = 7.8 . If a random sample of size n = 126 is selected,What is the mean of the distribution of sample means? μ ¯ x =What is the standard … read more
rajeevanpillai
Master's Degree
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A supermarket manager has determined that the amount of time
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 5 minutes. F… read more
Kofi
PhD in Statistics
Ph.D.
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Assume that blood pressure readings have a mean of 120 and a
Assume that blood pressure readings have a mean of 120 and a standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be lower than 122. r… read more
Kofi
PhD in Statistics
Ph.D.
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Start of Questions A manufacturer knows that their items
Start of Questions A manufacturer knows that their items have a lengths that are skewed right, with a mean of 15.6 inches, and standard deviation of 4.5 inches.If 49 items are chosen at random, what i… read more
akch2002
Master's Degree
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1. A credit card company decides to study the frequency with
1. A credit card company decides to study the frequency with which its cardholders charge for items from a certain chain of retail stores. The data values collected in the study appear to be normally … read more
Ryan
Bachelor's Degree
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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
Ryan
Bachelor's Degree
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18. Assume that a sample is used to estimate a population mean
18. Assume that a sample is used to estimate a population mean mu. Use the given confidence level and sample data to find the margin of error. Assume that the sample is a simple random sample and the … read more
Chirag
Master's Degree
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FOR JOHNCZHENG: You work for BreatheCorp, a manufacturer
FOR JOHNCZHENG: You work for BreatheCorp, a manufacturer of medical supplies, including portable oxygen concentrators. Your concentrators can come with two types of batteries: lithium ion and NiMH. 56… read more
Math-John
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The amount of time spent by North American adults watching television
The amount of time spent by North American adults watching television per day is normally distributed with a mean of 6 hours and a standard deviation of 1.5 hours. a) What is the probability that a ra… read more
R.R. Jha
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