There are 5 blue marbles and 4 red marbles in a bag. one marble is drawn from the bag and placed back into the bag. then, a second marble is drawn. what is the probability that the two randomly selected marbles are both red.

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Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Suppose that prices of a gallon of milk at various stores in one town have a mean of $3.71 with a standard deviation of $0.10. using chebyshev's theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.41 and $4.01? round your answer to one decimal place.