In general, if a distribution is unimodal and symmetric with no outliers, the range is approximately 6s

Question:

In general, if a is unimodal and symmetric with no outliers, the range is approximately 6s (see Exercise 57). Explain why this suggests that the standard deviation of the is approximately R/6, where R is the range.
Exercise 57
A of tests scores is unimodal and symmetric with mean = 60 points and standard deviation s = 10 points.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...