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after conducting a survey of all her classmates, midge discovers that the amount of money everyone spends buying books each month has a mean of $30. what does the mean say about the amount her classmates spend on books?

a. half of her classmates spend exactly $30 per month buying books.
b. half of her classmates spend more than $30 per month buying books.
c. the majority of her classmates spend $30 per month buying books.
d. if the amount spent on books per month by all her the classmates is leveled, that amount would be $30.

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.