As part of the work to perform a Monte Carlo simulation the following information about the unit variable operating costs that will be generated by a project is as follows: Expected unit variable operating costs: $200 95% confidence interval forecast of unit variable operating costs: $170 to $230 If the above unit sales are distributed normally, compute the approximate standard deviation for unit variable operating costs.

Group of answer choices

$7.50

$60.00

$15.00

$30.00