The energy information administration reported that the mean retail price per gallon of regu lar grade gasoline was $3.43 (energy information administration, july 2012). suppose that the standard deviation was $.10 and that the retail price per gallon has a bellshaped distribution. a. what percentage of regular grade gasoline sold between $3.33 and $3.53 per gallon? b. what percentage of regular grade gasoline sold between $3.33 and $3.63 per gallon? c. what percentage of regular grade gasoline sold for more than $3.63 per gallon?

Emery pharmaceutical uses an unstable chemical compound that must be kept in an environment where both temperature and humidity can be controlled. emery uses 825 pounds per month of the chemical, estimates the holding cost to be 50% of the purchase price (because of spoilage), and estimates order costs to be $48 per order. the cost schedules of two suppliers are as follows: vendor 1 vendor 2 quantity price/lb quantity price/lb 1-499 $17 1-399 $17.10 500-999 $16.75 400-799 $16.85 1000+ $16.50 800-1199 $16.60 1200+ $16.25 (a) what is the economic order quantity for each supplier? (b) what quantity should be ordered and which supplier should be used? (c) the total cost for the most economic order sire is $