Pre-Calculus

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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
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
687 satisfied customers
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 score on a nationwide examination in anthropology is different from 531. So, we choose a random sample of exam scores. The sa… read more
rajeevanpillai
Master's Degree
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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
rajeevanpillai
Master's Degree
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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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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
rajeevanpillai
Master's Degree
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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
rajeevanpillai
Master's Degree
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2 questions Suppose a university advertises that its average
for Scott, 2 questionsSuppose a university advertises that its average class size is 31 or less. A student organization is concerned that budget cuts have led to increased class sizes and would like t… read more
Scott
Master's Degree
1,855 satisfied customers
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
2,023 satisfied customers
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
687 satisfied customers
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
rajeevanpillai
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 new surgery is successful 85% of the time. If the results
a new surgery is successful 85% of the time. If the results of 8 such surgeries are randomly sampled, what is the probability that more than 5 of them are successful. Carry your intermediate computati… read more
Keith Pelletier
Master's Degree
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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_sharma
Master's Degree
Master's Degree
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The workers' union at a certain university is quite strong.
The workers' union at a certain university is quite strong. About 94% of all workers employed by the university belong to the workers' union. Recently, the workers went on strike, and now a local TV s… read more
Sandhya_sharma
Master's Degree
Master's Degree
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I am looking at a set of questions you answered 9 months
Hi Ryan, I am looking at a set of questions you answered 9 months ago. How can I get those answers. ***** ***** … 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
4,665 satisfied customers
1. For a particular sample of 80 scores on a psychology exam,
1. For a particular sample of 80 scores on a psychology exam, the following results were obtained. First quartile = 65 Third quartile = 98 Standard deviation = 8 Range = 56 Mean = 83 Median = 81 Mode … read more
Ray Atkinson
Bachelor's Degree
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