Main>Binomial Distribution>Standard deviation binomial distribution

## Standard Deviation Binomial Distribution: Overview

A binomial distribution is one of the simplest types of distributions in statistics. It’s a type of distribution where there is either success, or failure. For example, winning the lottery: or not winning the lottery. Most elementary statistics classes require you to find the standard deviation of the binomial distribution. This can be a challenge, because the variance and standard deviation formulas are daunting when you first look at them. However, if you break the formulas down into steps, they don’t look as scary. This how to will tell you how to find a standard deviation binomial distribution in just a few step

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## Standard Deviation Binomial Distribution: Steps

**Step 1:***Find the mean.*If you don’t know how to find the mean, see how to find the mean of the probability distribution.**Step 2:***Square the mean from step 1*. For example, if your mean is .9, .9²=.81. Set this number aside for a moment.

**Step 3:** *Make a probability distribution chart. If you’re not sure how to make one, see: **How to construct a probability distribution*.

**Step 4:***Square the top number (X) in each column and multiply it by the bottom number in the column (P(X))*. For example 0²*0.09 from the first column, 1²*0.07. Repeat for all columns.**Step 5:***Add all of the numbers in step 4 together.***Step 6:***Subtract the number you found in step 2 from the number you found in step 5*.

Step 5-Step 2=?.**Step 6:***Take the square root of the number you found in step 6.*

√Step 6=?

That’s how to find a standard deviation binomial distribution!

Questions? Post them on our FREE statistics forum. Out stats guy will be happy to answer your questions (he’ll even tackle homework problems!).

With this section its okay until you get down to the 4th step and then I am lost although this article did help me figure out how to finish the problem. So I am glad that they do have this information in here for us to look at so we have something to fall back on.

It would be helfpul if you provived the results next to each step so we can work the problem as we follow each step and make sure we are calculating correctly.

I wish I would have read this information before I did the long walk to ace for help! I chart is a lot of help but I agree the steps are a little confusing, just read over them two times and it will make sense.

This was very helpful. I was confused on the probablility distribution chart

Your explanation here is much simpler and easier to follow than the one given in the book. I agree, it’s great to have this blog to fall back on.

This blog did help me to understand standard deviation better, but it would be better if the problem was written out with each step. I think this would help all us visual learners!

This blog really helped me with the probability chart because I was really confused for the longest time as I am sure you are well aware of. I really like looking on this because I feel like I get a better understanding.

This example is very helpful because it has the links to other problems that we have already covered. We learn things in previous sections but it is always nice to be able to go back for a refresher.

This example was very helpful and It helped me with ch8 hw.

it is a good example.it help me a loot

it is a good example.it help me alooot.