"active investment management may at times generate additional returns of about .1%. however, the standard deviation of the typical well-diversified portfolio is about 20%, so it is very difficult to statistically identify any increase in performance." even if true, this statement is an example of the problem in deciding how efficient the markets are. a. magnitudeb. selection biasc. lucky eventd. allocation

Oz makes lion food out of giraffe and gazelle meat. giraffe meat has 18 grams of protein and 36 grams of fat per pound, while gazelle meat has 36 grams of protein and 18 grams of fat per pound. a batch of lion food must contain at least "46,800" grams of protein and 70,200 grams of fat. giraffe meat costs $1/pound and gazelle meat costs $2/pound. how many pounds of each should go into each batch of lion food in order to minimize costs? hint [see example 2.]