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160 Answered Questions for the topic Standard Deviation

Standard Deviation

09/26/15

Using the empirical rule

Suppose that the mean height of 10th grade boys is 69 inches with a standard deviation of 2 inches and that it follows a normal distribution. Using the empirical rule, determine the percentage of... more
Standard Deviation Statistics Average

07/15/15

PLEASE HELPP!!

The following data, heartbeats per minute, was collected for a group of 10 men subjected to a stressful situation.120, 122, 124, 127, 127, 133, 140, 141, 142, 1441. What is the average heatbeats... more
Standard Deviation

06/24/15

Americans spend an average of 5 hours per day online. If the standard deviation is 37 minutes, find the range in which at least 93.76% of the data will lie.

Americans spend an average of 5 hours per day online. If the standard deviation is 37 minutes, find the range in which at least 93.76% of the data will lie.    
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
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
Standard Deviation Math Statistics

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? 
Standard Deviation Math Probability

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
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
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!
Standard Deviation Math Statistics

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
Standard Deviation Statistics Probability

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
Standard Deviation Probability Percentage

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
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
Standard Deviation Statistics Applied

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
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
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
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
Standard Deviation Statistics Statistics Question

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
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
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
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
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

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
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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