182 Answered Questions for the topic Standard Deviation

Standard Deviation

06/24/15

Suppose an exam had an average (mean) score of 55%
Suppose an exam had an average (mean) score of 55% and a standard deviation of 15%. Table 6.3 Curving GradesA 1.5 standard deviations above the mean or higherB 0.5 to 1.5 standard deviations about... more
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Standard Deviation

06/09/15

standard deviation
A state university has no French course, instead places all freshmen scoring at least 60 on a proficiency exam (Mean=50, Standard Deviation =10) to an advanced composition course. If the scores are... more
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Standard Deviation Math Statistics Probability

05/05/15

The mean high temperature for a town in Saskatchewan is -15 degrees and the standard deviation is 6 degrees.
What is the probability that the temperature will get above zero? 
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Standard Deviation Math Probability Median

05/05/15

Given the following frequency distribution, find the mean, median, mode and standard deviation. draw the histogram.
Score          100     95     90     82 Frequency     1        2       3       4
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Standard Deviation

04/23/15

The mean is 93.8 and the standard deviation is 6.2. Find the z score for the data item 79
The mean is 93.8 and the standard deviation is 6.2. Find the z score for the data item 79
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Standard Deviation

04/23/15

what is the standard deviation of 2.3000, 1.7333, 1.6000, 2.6667 ?
I just need to know the standard deviation for 4 different numbers:   2.3000 1.7333 1.6000 2.6667   Help please!
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Standard Deviation Math Statistics Math Help

03/31/15

Compute the Mean & Standard Deviation from percentile values of a distribution
I have been given values for 10%, 50% and 90% of a distribution. From these numbers, how can I compute the mean and standard deviation?   I'll give an example....Temperature distribution 10th... more
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03/24/15

Help finding the sample size! Statistics
A paint manufacturer uses a machine to fill gallon cans with paint.   a)The manufacturers wants to estimate the mean volume of paint the machine is putting in the cans within 0.25 ounces.... more
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Standard Deviation Probability Percentage Mean

03/14/15

Finding a % with Mean and Standard Deviation
Manbir is a local fisherwoman who has been recording the mean weight of the fish that she catches. She discovered that the distribution of weight is normal with a mean of 2.9kg and a standard... more
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Standard Deviation

02/12/15

A student scores 61 on a test. The class average is 81, with a standard deviation of 10 points. What percentage of the class scored below this student?
A student scores 61 on a test. The class average is 81, with a standard deviation of 10 points. What percentage of the class scored below this student?   How do I solve this problem?  Any help... more
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Standard Deviation Statistics Applied Bell Curve

01/15/15

statistics
Janey always waits until her gas tank is nearly empty before she refuel a.   She keeps a record of the distance she drives on each tank of gas.  The distance varies, depending on the weather and... more
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Standard Deviation Math Algebra

01/04/15

Need urgent helop on Algebra questions!
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a certain person has an IQ of 131,  what percentage of the population has a lower IQ?       2. IQ... more
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Standard Deviation Normal Distribution

12/22/14

What are the cutoffs for B?
Suppose exam scores form an approximately normal distribution that has μ = 500 points and σ = 100 points. Letter grades on the exam were distributed as follows: Ds made up 16% of the exam, Cs 30%,... more
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Standard Deviation

11/04/14

Who is the more consistent bowler? Standard Deviation
At the end of a bowling tournament, three friends analyzed their scores.  Erinn's mean bowling score is 92 with a standard deviation of 14.  Declan's mean bowling score is 130 with a standard... more
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Standard Deviation Statistics Statistics Question Mode

10/19/14

HELP!! std. dev, mode and mean.
There are 5 participants in a study. All I have are some statistics to find out the individual numbers for the 5 people. The mean is 8, the standard deviation is 4, the mode is 5 and the range is... more
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Standard Deviation

10/16/14

what percentage of scores are between 56 & 77
there are 2,000 freshman who take integrated math 1 at Statesville high school. the scores for the last unit test were distributed normally with a mean of 70 and a standard deviation of 7
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Standard Deviation

10/16/14

a set consists of 96 elements .The range of the set is 10 and mean is 12.6 , what is standard deviation of the set ?
please give me the explination
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Standard Deviation

10/07/14

Standard deviation
Karen bought a book for $55. If book prices are normally distributed with a mean of $40 and standard deviation of $10, how many books (in terms of percentages of the total) are more expensive than... more
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Standard Deviation

09/07/14

what is the cut off height for the shortest 20% of babies with an average of 65cm and standard deviation of 10cm
Please show the steps so I can understand how to solve the problem
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09/02/14

Finding the percentage from the normally distributed mean and standard deviation? Help please :)
So, this is the question I'm have difficultly working out, I've come close to the answer but my calculations are clearly going wrong, anyway, here's the question and the help would be much... more
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Standard Deviation

08/22/14

a population has a mean of 45 and a standard deviation of 5. find the raw scores of the following z-scores: z-score=1.3
z-score =1.3
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Standard Deviation

04/17/14

what is the positive difference between Ronald's height and the mean height?
with a height of 68in , Ronald was the shortest president of a particular club in the past century. The club presidents of the past century have a mean height of 71.4 in and a standard deviation of... more
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Standard Deviation

03/31/14

find Pr[X=66.86]
Given a normal random variable X with the mean 62 and a standard deviation 3,  find Pr[X≤66.86]
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Standard Deviation

03/11/14

i do not know how to sart this questio kindly help me
The lifetimes of a colour TV picture tube is normally distributed, with a mean of 8 yrs and a standard deviation of 2 years. (i) What is the probability that a picture tube will last more than 10... more
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Standard Deviation Statistics Question

02/22/14

What is the minimum "usual" value equal beats per minute?
A certain group of tests subject had pulse rates with a mean of 77.1 beats per minute and standard deviation of 12.6 beats per minute. Would it be unusual for one of the test subjects to have a... more
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