160 Answered Questions for the topic Standard Deviation

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 ....
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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.

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...
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Standard Deviation

02/09/16

#### If the variance is 64, what would the standard deviation be for this set of data of 15 values?

If the variance is 64, what would the stdandard deviation be for this set of data of 15 values?

Standard Deviation

02/09/16

#### For the following test grades, find the standard deviation of the sample:

For the following test grades, find the standard deviation of the sample:98 100 60 86 76 98

02/05/16

#### How to do these questions?

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...
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01/26/16

#### fluorescent light bulbs last, on average 10,000 hpurs. the standard diviation is 500 hours.what percent of the light bulbs burn out within 11,000 hours?

i need to find out what percent of lightbulbs burn out within 11,000 hours

01/26/16

#### the data ia incomplete. the mean is 120 and 84% is less than 130. find the standard diviation

i need to find the standard diviation for the data set

01/24/16

#### HELPPPPPPPPP PLEASE!!!!!!! Seriously need help on this!!!

A company’s manufacturing process uses 500 gallons of water at a time, a scrubbing machine then removes most of the chemical pollutant before pumping the water into a lake. Legally the treated...
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Standard Deviation Statistics

01/24/16

#### Standard Deviation - No idea

A company’s manufacturing process uses 500 gallons of water at a time, a scrubbing machine then removes most of the chemical pollutant before pumping the water into a lake. Legally the treated...
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Standard Deviation

01/18/16

#### the amount of change within a group.?

i have 3 participants . measured at 4 different contexts.
i want to calculate which of the 3 participants showed the most variant results. meaning which of them exhibits the most change when...
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12/14/15

#### The following question has to do with statistics

Maria Thomas a teacher at Henry elementray school noted grades of her students which were distributed with a mean of 74 and a standard deviation of 10. María thomas has informed us that 6.3 percent...
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Standard Deviation Math

12/10/15

#### Find the standard deviation - how do I plug in numbers to this formula

The quiz scores are below.
5 3 9 10 9 9 10
10 10 9 6 4 9 9
The formula is s = Σ (x--x)2
√ -----------
(n-1)
The -x is...
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Standard Deviation

12/10/15

#### standard deviations

mean 8 and standard deviation 0.5
how many standard deviations 6.9 is below the mean

12/10/15

#### Descriptive Statistics (mode, median, mean, range, standard deviation)

1) 64.5 63.5 63.5 65 66 65.5 61 66 64 65
The data above represents the heights, in inches, of a random sample of adult American women. For this data calculate the:(a) Mode(b) Median(c)...
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Standard Deviation Math

11/22/15

#### standard deviation

scores on a test are being normally distrubuted. mean 73.0 standard deviation 5.0. 100 students were tested. how many students scored between 68 and 78? how many students scored below 63?

Standard Deviation Standard Error

11/20/15

#### standard error of sample proportion

A new Rassmussen Report national telephone survey finds that just 32% of American adults favor "sin taxes" on soda and junk food. The survey was based on a sample of 1,000 Americans adults. Based...
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11/20/15

#### the margin of error would be what?

The length of time what a space rocket component functions is approximately normally distributed. A sample of 20 of these components showed a mean of 900hours with a standard deviation of 87 hours....
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Standard Deviation

11/04/15

#### Standard deviation question

The mean weight of loads of rock is 43.0 tons with a standard deviation of 12.0 tons. If 16 loads are chosen at random for a weight check, we wish to compute the probability that the mean weight of...
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Standard Deviation

11/04/15

#### Standard deviation question

The mean weight of loads of rock is 43.0 tons with a standard deviation of 12.0 tons. If 16 loads are chosen at random for a weight check, we wish to compute the probability that the mean weight of...
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11/04/15

#### in 1995, SAT math scores werenormally distributed with mean 500 and standard deviation 100 points.

What percent of students scored greater than 410?

Standard Deviation Normal Distribution

11/04/15

#### The results of an IQ test have a mean of 100, and scores are normally disributed with a standard deviation of 15 points.

What is the IQ score of the person at the 79th percentile?
I got 81 but I don't know if I'm doing it right

Standard Deviation Variance

11/02/15

#### variance and standard deviation?

A production system with five production lines produces thousands of items per day. From past experience it is known that one out of every 10 products coming out of each production line is...
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10/27/15

#### Student t Distribution Problem

Question/Problem:
Data Set 1 in Appendix B lists the white blood cell counts (1000 cells/µL) of 40 randomly selected women. The mean of those 40 values is 7.15 and the standard deviation is 2.28....
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10/03/15

#### Normal Distribution

Suppose that replacement times for washing machines are normally distributed with a mean of 10 years and a standard deviation of 1.4 years. Find the replacement time that separates the top 18% from...
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