In a variables sampling application, an auditor draws random samples from two equal-sized groups of inventory items. The mean value of the inventory in the first group was calculated to be $3,000, with a standard deviation of $500. The mean value of inventory in the second group was estimated to be $1,000, with a standard deviation of $90. If the auditor had drawn an unstratified sample from the entire population, the expected mean value of inventory would be $2,000, and the expected standard deviation would be A. Greater than $500. B. $295. C. Between $90 and $500, but not $295. D. Less than $90