# Basic Statistics

#### arceaf

##### New Member
Hi,

I am using statistics to develop a finacial model on excel.

I have created a table that lists returns of a security over a given period of time. I have used formulas to calculate the mean and standard dev of the returns.

Right now, I am using the norm.inv function =norm.inv(.05, Standard Dev, Mean) to come up with the minimum return @ a 95% confidence.

Now, I want to come up with the MAX return at 95% confidence, but don't know which formula I should use:

Should I use:

NORM.INV(0.95,Mean,Standard dev)
or
NORM.DIST(0.05,Mean,Standard dev,TRUE)

I really appreciate the help!

#### jkpieterse

##### Well-known Member
AFAIK the 95% interval for a normally distributed dataset is simply:

Min:
Average - 2 * StDev
Max:
Average + 2 * StDev

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