Suppose there are two types of persons: high-ability and low-ability. a particular diploma costs a high-ability person $10,000 and costs a low-ability person $18,000. firms wish to use education as a screening device where they intend to pay $35,000 to workers without a diploma and $k to those with a diploma. in what range must k be to make this an effective screening device?

What is the distance between point a and b

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

How can you find the mean absolute deviation (mad) for this set of data?