182 Answered Questions for the topic Standard Deviation

Standard Deviation

07/02/16

The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds..
The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an? individual's clotting time will be less than 6 seconds or greater than 9... more
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Standard Deviation Statistics Question

06/26/16

If birth weights in a population are normally distributed with a mean of 109oz and a standard deviation of 130z.
A) What is the chance of obtaining a birth weight of 141 oz or heavier when sampling birth records at random? B) What is the chance of obtaining a birth weight of 120 or lighter?
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Standard Deviation Statistics Mean Variance

05/31/16

Standard deviation question+answer
The question:   The ages, x years, of 150 cars are summarised by     ∑x = 645 and ∑x2 = 8287.5   Find ∑(x-y)2 where y denotes the mean of x.     The answer:   y= 4.3   standard... more
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Standard Deviation Algebra 2 Mode Mean

05/20/16

Standard deviation
set of data with 1200 numbers is normally distributedwith a mean of 27 and a standard deviation of 4. how many numbers in the data would you expect to be between 23 and 31?
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05/06/16

Central Limit Theorum
Assume the population mean is µ=12 and standard deviation 2. By Central Limit Theorem the random sample of 121 measurements from this population would have what kind of distribution?
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Standard Deviation Statistics Probability

04/23/16

Probability Statistics 1
Readings on a thermometer are normally distributed with a mean of 0C° and a standard deviation of 1.00.What is the probability that a randomly selected thermometer reads:a. Less than 0.53. b.... more
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Standard Deviation Null Hypothesis Testing

04/22/16

Null Hypothesis
Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen... more
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Standard Deviation

04/21/16

Please answer this question
The depot is using a standard of 650 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications... more
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Standard Deviation

04/18/16

Can someone check this
Exam scores from a previous STATS 200 course are normally distributed with a mean of 74 and standard deviation of 2.65. Approximately 95% of its area is within: a. One standard deviation of the... more
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Standard Deviation Intervals Confidence

04/11/16

help with part of a question
You take a sample of 22 from a population of test scores, and the mean of your sample is 60.You know the standard deviation of the population is 10. What is the 99% confidence interval on the... more
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Standard Deviation

04/08/16

Hello, can someone help me answer this question?
2. Consider the following table of the ages of our first six presidents.Ages of the First 6 Presidents at Inauguration Washington 57J. Adams 61Jefferson 57Madison 57Monroe 58J.Q. Adams 57 a. Find... more
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Standard Deviation

04/08/16

Standard Deviation, can someone please help me?
 The heart rates for puppies are normally distributed, with a mean heart rate of 180 beats per minute (60-160 beats per minute for most adult dogs) with a standard deviation of 6 bpm (beats per... more
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Standard Deviation

03/31/16

The standard deviation of 60% of 250?
Hi Guys, may I please get help with this one problem: 60% of the computer chips produced at a factory are good; the others are defective. A box contains 250 chips from the factor. Let X be the... more
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Standard Deviation Deviation Percent

03/30/16

Standard Deviation
Consider a nationally recognized standardized college admissions test with scores that are normally distributed, centered at a mean of 21, and have a standard deviation of 4.5. Use the 68-95-99.7... more
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Standard Deviation Statistics Question Mean Confidence

03/29/16

Statistics question: A random sample of 40 statistics students had an average test grade of 81.5
A random sample of 40 statistics students had an average test grade of 81.5 and a standard deviation of 10.2. Construct the confidence interval for the population mean, μ if c = 0.90.   The... more
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Standard Deviation

03/28/16

Use the following data: 11, 14, 15, 19, 10. What's the standard deviation?
Use the following data: 11, 14, 15, 19, 10. What's the standard deviation?
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Standard Deviation Statistics Question Mean

03/27/16

Statistics Question: The repair cost of a Subaru engine is normally distributed with a mean of $5,850 and standard deviation of $1,125.
The repair cost of a Subaru engine is normally distributed with a mean of $5,850 and standard deviation of $1,125. Random samples of 20 Subaru engines are drawn from this population and the mean... more
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Standard Deviation Statistics Question Mean

03/27/16

Statistics Question: The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F
The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F and a standard deviation of 0.60° F. If 36 summer days in Orlando are randomly selected, find the... more
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Standard Deviation Statistics Statistics Question Mean

03/27/16

statistics question: The salaries of Pet Detectives are normally distributed with a mean of $32,000
The salaries of Pet Detectives are normally distributed with a mean of $32,000 and a standard deviation of $3000. If 100 Pet Detectives are randomly selected, find the probability that their... more
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03/22/16

can somone please check my work.
The data from placebo 0mg is listed below. 57,27,32,31,34,38,71,33,34,53,36,42,26,52,36,55,36,42,36,54,34,29,33,33     What is the mean number of correct responses of the participants after... more
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Standard Deviation Probability & Statistics

03/20/16

standard deviation find the probability that more than 30%
A manufacturer produces a certain type of components that has a length of 2.1 cm. the distribution of this components is normal with mean 2.15 cm and sd 0.4cm. There are 50 pieces in a bag. Find... more
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Standard Deviation Statistics Mean Distribution

03/13/16

Find mean and St .dev., when 35% patients suffer from side effects and 15 are given the drug.
Clinical trials have found 35% of patients are likely to suffer side effects from a drug which treats migraine. In a clinic, it is prescribed to 15 patients a month.  -> find the mean and St .... more
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Standard Deviation Statistics Mean Distr

02/21/16

Describe a scenario
Describe a scenario where you expect a set of data to have   a.) a large standard deviation    b.) a small standard deviation       The prize for winning a contest can be chosen from... more
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02/21/16

A normally distributed data has been
A normally distributed set of data has been generated where 50% of the data lies below 97 and 70% lies below 104. Determine the mean and standard deviation of this data.
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Standard Deviation Statistics Z Scores Mean

02/20/16

The edible portion of grape clusters
The edible portion of grape clusters from a Mexican farm were measured to have a mean weight of 429.5 g and a standard deviation of 42.8 g. For selling purposes, the clusters are divided into two... more
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