182 Answered Questions for the topic Standard Deviation

Standard Deviation

08/22/18

What is the variance and standard deviation of 77,96,87,81,62,90 and 84?
What is the variance and standar deviation?
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Standard Deviation Statistics Z Scores

07/10/18

Standard deviation and z-scores
Assume that the salaries of elementary teachers in the United States are approximately normally distributed with a mean of $32,000 and a standard deviation of $6,000. What is the approximate... more
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06/16/18

Homework Help really struggling
Question 6    Which of the following is NOT TRUE concerning the graphic depiction ("the curve") of a distribution for means?Question options: A) The curve is skewed to the right.  B) The area under... more
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Standard Deviation Algebra 2

06/14/18

Help me with this problem please
The average adult Indian Rhino weighs 4600 pounds with a standard deviation of 500 pounds. a) What percent of Indian Rhinos are more than 4000 pounds? b) Rhinos in the 80th percentile are called... more
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Standard Deviation Math Help Statistics Question

05/22/18

standard deviation
whats the standard deviation of the data set below, Rounding your answer to three decimal places?2, 4, 6, 6, 8, 10, 11, 12, 14, 16, 17, 18, 18, 18
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Standard Deviation

05/05/18

How do I determine the whole number of standard deviations that includes all data values?
The mean length of Beethoven’s nine symphonies is 37 minutes; the standard deviation is 12 minutes. The datavalues are the following minutes: 23, 30, 47, 35, 30, 40, 35, 22, and 65. Determine the... more
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04/27/18

To find the Mean and Standard Deviation
Total amount of time (x, in minutes) spent commuting by the entire 240 residents of a housing area was recorded.   Given that total x = 10,980 and total ( x - µ )² = 23,191. Compute the mean and... more
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Standard Deviation Algebra 2 Word Problem

04/11/18

About how many members are expected to be between 15 years old and 31 years old?
The ages of members of an online gaming group are normally distributed with a mean of 23 years and a standard deviation of 4 years.There are 300 members in the group.
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Standard Deviation Algebra 2 Word Problem Z Score

04/11/18

How many of the members will weigh 165 pounds or more?
The weights of members of a baseball league are normally distributed with a mean of 176 pounds and a standard deviation of 11.4 pounds. Consider a league membership of 120 members.
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Standard Deviation Algebra 2 Word Problem Z Score

04/11/18

What is the age of a movie attendee with a z-score of −1.2 ?
The ages of people in a movie theater are normally distributed with a mean of 32 years and a standard deviation of 6.2 years. (round to nearest tenth)
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Standard Deviation

03/15/18

If IQ scores have a mean of 100 and a standard deviation of 16 points, what IQ score do you need to be considered a genius
People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses.
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Standard Deviation

03/12/18

How would I meet the requirements for the "shape, center, and spread of distributions" with the collected information (in description)?
A part of my statistics project says to do "shape, center, and spread of distributions" with the information I collected from an experiment. I think that has to do with the bell curve and standard... more
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Standard Deviation Statistics Question

03/08/18

The weight of a sperm whale’s brain is normally distributed with a mean of 15.5 pounds and a standard deviation of 3.6 pounds.
The weight of a sperm whale’s brain is normally distributed with a mean of 15.5 pounds and a standard deviation of 3.6 pounds. What is the probability a randomly selected sperm whale will have a... more
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Standard Deviation Dispersion

01/30/18

Show that for any 2 numbers a and b, standard deviation is given by |a-b|÷2
The variance is taken to solve it and to show the s2= |a+b|                  2   I don't know why                
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Standard Deviation

01/16/18

Is it possible for the standard deviation of a set of data to be zero? Explain.
 standard deviation 
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Standard Deviation

01/13/18

500 units with 20 units checked for speed what is the standard deviaition
I'm not much on higher math but would I use "n" or "N-1"
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Standard Deviation

12/08/17

please helpstandard deviation
The mean lifetime of a certain tire is 30,000 miles and the standard deviation is 2500 miles. If we assume nothing about the shape of the distribution, approximately what percentage of all such... more
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Standard Deviation Math Algebra Math Help

12/05/17

Math homework help
The distribution of the weights of 100 students has a mean of 168lbs with a standard deviation of 16lbs. Predict the number of students who have weights between 135 and 175 pounds.
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Standard Deviation

10/26/17

how many students scored within one standard deviation of the mean?, please show working.
mean 6.3 standard deviation 1.49   students scores: 4,5,5,6,6,6,7,7,8,9
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Standard Deviation

10/25/17

HOW MANY STUDENTS SCORED WITHIN ONE STANDARD DEVIATION OF THE MEAN? PLEASE SHOW WORKING OUT
MEAN : 6.3 MODE:6 MEDIAN:6 STUDENTS SCORES: 4,5,5,6,6,6,7,7,8,9 STANDARD DEVIATION: 1.49
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Standard Deviation

10/06/17

standard deviation
country a annual exports to country b are $3.2bilion on average with standard deviation of 0.28 billion. country a annual imports to country b are $3.5 bilion on average with standard deviation of... more
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Standard Deviation

10/06/17

net income standard deviation
how would you find the standard deviation of the net income? 
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Standard Deviation Statistics Statistics Question

09/19/17

find the randomly selected adult that has an iq between 83 and 115
Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard deviation of 15 .
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Standard Deviation Statistics

09/15/17

Standard deviation 3
In a large class of 500 students, the mean and standard deviation of a final exam are 65 and 11, respectivelyIf the grades have symmetric distribution, how many students have grades within 2... more
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Standard Deviation Statistics Mean

09/15/17

standard deviation 2
In a large class of 500 students, the mean and standard deviation of a final exam are 65 and 11, respectivelyIf the grades distribution is not symmetric at least how many students have grade within... more
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