NEED HELP ASAP The number of hours per week that twenty students in a mathematics classroom study are represented by the data below.

1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 5, 6, 7, 7, 7, 9, 9, 9, 9

Which statements about the data are true? Choose all that are correct.

A) The median number of hours spent studying per week is 3.

B) The mean number of hours spent studying per week is 4.55.

C) The median number of hours spent studying per week is 4.

D) The mean absolute deviation of time spent studying per week is approximately 2.7 hours.

E) The number of hours spent studying per week cluster closely around the median number of hours spent studying.

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.

Select all expressions that are equivalent to 2(3x + 7y). question 1 options: 6x + 14y 6x + 7y 1(6x + 14y)

If a is a nonzero real number then the reciprocal of a is