Pre-Calculus

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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
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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
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
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
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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
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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
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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
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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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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
rajeevanpillai
Master's Degree
Master's Degree
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Assume that 12 jurors are randomly selected from a
Assume that 12 jurors are randomly selected from a population in which 83% of the people are Mexican-Americans. Refer to the probability distribution table below and find the indicated probabilities. … read more
rajeevanpillai
Master's Degree
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
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Master's Degree
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Research shows that 30% of all women taking a certain
Research shows that 30% of all women taking a certain medication do not respond favorably. Find the probability that among 9 randomly selected women taking the medication less than 2 will not respond … 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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A candidate claims that they will get more than 50% of the
A candidate claims that they will get more than 50% of the vote in an upcoming election. You sample 450 voters and found that 215 of them plan to vote for the candidate. What is the correct P-value? R… read more
Sandhya
Master's Degree
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The history data of an airline company show that 5% of the
The history data of an airline company show that 5% of the people that book a flight do not show up. If 42 people made a booking for a flight with a 40-seat small plane. What is the probability that t… read more
R.R. Jha
Bachelor's Degree
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A new surgery is successful 75% of the time. If the results
A new surgery is successful 75% of the time. If the results of 8 such surgeries are randomly sampled, what is the probability that at most 5 of them are successful?… read more
R.R. Jha
Bachelor's Degree
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I need help again with statistics again and ask that you
I need help again with statistics again and ask that you help me with some other examples Identify the sample space of the probability experiment and determine the number of outcomes in the sample spa… read more
Ray Atkinson
Bachelor's Degree
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