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**leaaa** Hi All,

Im really stressed =[

I have started my Business IT degree at Uni and I have a module on 'Statistics and Data Analysis' for the first Semester.

I just have to get past this exam and then I dont have to worry about it again!

The problem is though, although I did really well on my GCSEs I done very badly in Maths. My ALevels did not consist of anymaths at all so its been a while!

I'm struggling so much with Standard Deviation.

The teacher has given me the typical equation, but he has *(n-1)* underneith the equation.

When I look online I cant find why he has this.

It just has *n *on the normal standard deviation equation.

Can someone tell me if *n *always equals to 10? or does it equalto the number of values you have?? As all of the practice questions state *n *as 10.

I have explained to my lecturer that i need extra support but our class is too big so he has no tmie to fully explain things to me..

Can anyone help? x