Standard deviation of the sampling distribution is using incorrect calculation

[catherinecarter]

The standard deviation of the sampling distribution is equal to the standard error of the mean for n projectiles.

Currently, the SD of the sampling distribution is using the following formula:
SD = $\sqrt{\sum(x_i - xbar)^2/n}$

The correct formula is:
SD = $\sqrt{\sum(x_i - xbar)^2/(n - 1)}$

In these equations, $x_1$ refers to the mean of each sample, and $xbar$ refers to the mean of means. n is the sample size.

The values will be close, especially for larger n, but I'm noting here that the calculation is incorrect currently.

[samreid]

@matthew-blackman will you please evaluate and take the first steps here?