# Thread: Relation between n, p, q, and sigma

1. ## Relation between n, p, q, and sigma

I know the value of n and p. I am looking for the standard deviation and mean based on those values. I gather that the forumla for sigma, the standard deviation, is:

sigma = square root of n*p*q

I do not know the value of q.

How can I find sigma? Do I need to find q first? If so, how do I find q if I only know n and p?

Thanks.

2. ## Re: Relation between n, p, q, and sigma

q is just 1-p

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•