I need to compute a series of 20 measurements and produce a mean & standard deviation quickly. this is for a timed exam. I have the manual and tried to follow their steps to no satisfaction. Please help

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Check out chapter 11 in the user's guide. This chapter gives you the run down on how to calculate what you are looking for.

Posted on Dec 02, 2010

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Posted on Jan 02, 2017

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The standard deviation is a measure of how "tight" the samples are distributed around your mean.

In layman's terms, a small standard deviation indicates that most of your measurements are in the vicinity of the means; a large standard deviation corresponds to readings that are all over the place.

You could also say that the smaller the SD, the more your mean is representative of the data set.

For a better explanation, just look up Standard deviation on Wikipedia!

In layman's terms, a small standard deviation indicates that most of your measurements are in the vicinity of the means; a large standard deviation corresponds to readings that are all over the place.

You could also say that the smaller the SD, the more your mean is representative of the data set.

For a better explanation, just look up Standard deviation on Wikipedia!

May 03, 2014 | Audio Players & Recorders

To convert an x value to a z-score, the formula is:

(x value - mean)/standard deviation

Example: We have a number of height measurements that have a mean of 65.25 and a standard deviation of 2.84. One value is 68.5. To convert it to a z-score: (68.5-65.25)/2.84 = 1.144

Hope this helps!

(x value - mean)/standard deviation

Example: We have a number of height measurements that have a mean of 65.25 and a standard deviation of 2.84. One value is 68.5. To convert it to a z-score: (68.5-65.25)/2.84 = 1.144

Hope this helps!

Oct 19, 2013 | Texas Instruments TI-36X Pro Scientific...

The standard deviation is a measure on the variability of a number set from its average. Since all numbers in your set are the same, there is no variation from its average, and the standard deviation is 0.

Jan 25, 2011 | Texas Instruments TI-84 Plus Silver...

64 62 52 50 70 60 55 20 25 48 35 55 55 47 64 42 36 50 30 53 51 63 58 50
60 54 33 48 40 76 61 46 65 65 15 45 58 40 64 18 33 40 64 18 33 40 48 9
38 41

Highest value observed: 76

Lowest Value: 9

Standard deviation from the ungrouped data: 15.25

Frequency:

Mean: 46.94

Standard deviation from grouped data: 15.40

Highest value observed: 76

Lowest Value: 9

Standard deviation from the ungrouped data: 15.25

Frequency:

Mean: 46.94

Standard deviation from grouped data: 15.40

Oct 23, 2009 | Microsoft Excel for PC

Jill. She scored two standard deviations above the mean, while he only scored one-and-a-half standard deviations above the mean.

Sep 11, 2009 | Texas Instruments TI-86 Calculator

M=500 and S=100 in a normal distribution, what percentage of the subjects have scores between 400 and 600

Jun 03, 2009 | Casio Office Equipment & Supplies

Mode - 2 - STAT - 1(VAR) Then put your data: 25,34,13

Then press AC which is the clear button and then SHIFT - 1(STAT) - 5(VAR) 2 (X) =

Voila!

Then press AC which is the clear button and then SHIFT - 1(STAT) - 5(VAR) 2 (X) =

Voila!

Jun 08, 2008 | Casio fx-300ES Calculator

I want to calculate a standard deviation on BA II plus

Apr 23, 2008 | Texas Instruments BA-II Plus Calculator

Standard deviation is the average root mean squared deviation from the average of the numbers.

Familiarize yourself with the wikipedia page on standard deviation: http://en.wikipedia.org/wiki/Standard_deviation

In this case, your question is easy. The standard deviation is 0, so this means the boys ages are all the same.

So they're all 24/3 = 8 years old.

Proof:

8 + 8 + 8 = 24 <-- satisfies the constraint that the boys ages must total to 24.

Get the standard deviation of these numbers;

8+8+8 / 3 = 8 <-- the average value is 8

The deviation of each boy's age from the average is:

boy 1

--------

8 years old, which deviates from 8 by 0

boy 2

--------

8 years old, which deviates from 8 by 0

boy 3

--------

8 years old, which deviates from 8 by 0

So the deviations are 0, 0 and 0.

To get the standard deviation, you sum the squares of the deviations of each boy, get the average, and square root. So:

0² + 0² + 0² = 0

Average is 0 / 3 = 0

Square root of 0 = 0

So the standard deviation is 0. Which shouldn't be much of a surprise to you. We just had to actually DO the work to show that it was in fact 0.

Familiarize yourself with the wikipedia page on standard deviation: http://en.wikipedia.org/wiki/Standard_deviation

In this case, your question is easy. The standard deviation is 0, so this means the boys ages are all the same.

So they're all 24/3 = 8 years old.

Proof:

8 + 8 + 8 = 24 <-- satisfies the constraint that the boys ages must total to 24.

Get the standard deviation of these numbers;

8+8+8 / 3 = 8 <-- the average value is 8

The deviation of each boy's age from the average is:

boy 1

--------

8 years old, which deviates from 8 by 0

boy 2

--------

8 years old, which deviates from 8 by 0

boy 3

--------

8 years old, which deviates from 8 by 0

So the deviations are 0, 0 and 0.

To get the standard deviation, you sum the squares of the deviations of each boy, get the average, and square root. So:

0² + 0² + 0² = 0

Average is 0 / 3 = 0

Square root of 0 = 0

So the standard deviation is 0. Which shouldn't be much of a surprise to you. We just had to actually DO the work to show that it was in fact 0.

Feb 08, 2008 | Audio Players & Recorders

This calc will do standard deviations. In the manual it is on page 2 and also on page 40.

Sep 07, 2006 | Casio FX-7400G Plus Calculator

Jan 17, 2014 | HP 33s Calculator

Dec 17, 2012 | HP 33s Calculator

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Usually answered in minutes!

refer to the 33s manual; Statistical Operations 11-1 entering one variable data. once you have entered the data using the top left key (Sums+) use the other top keys to select yor answer.

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