160 Answered Questions for the topic Standard Deviation

Standard Deviation Statistics

04/11/19

#### We have a mean of 126 and standard deviation of 18. Use the 68-95-99.7 rule to determine the percent of scores in the data set expected to be between the scores 72 and 144. Give your answer in decimal

Standard Deviation Statistics

03/24/19

#### When Finding standard Deviation do you use numbers in the data set that are zero?

I am doing a data report on a survey done on the number of hours students work per month. Some students do not work so their number was 0. I am finding the standard deviation for the data set and I...
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Standard Deviation

09/25/18

#### 500 with a standard deviation of 150, on which exam did Carlita perform better?

Carlita scored a 32 on her math ACT and a 730 on her math SAT examinations. Given that the average math ACT score is 18 with a standard deviation of 6 and the math SAT score has an average score of...
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09/12/18

#### What were the original eight measurements collected using the mean and deviations?

Students collected eight length measurements for a mathematics lab. The mean measurements was 46.3 cm. and the deviations of seven individual measurements were 0.8 cm, -0.4 cm, 1.6 cm, -1.2 cm,...
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Standard Deviation

08/23/18

#### Standard deviation

If the common salary is 37,000 with a standard deviation of 4,000 would asalary of 32,500 be reasonabler

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?

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...
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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...
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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...
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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

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...
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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...
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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.

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)

04/11/18

#### What is the z-score of 105? (round to nearest hundredth

A normal distribution has a mean of 102 and a standard deviation of 2.9.

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.

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...
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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...
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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

Standard Deviation

01/16/18

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

standard deviation

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"

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...
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#### 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.

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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