Aset of card includes 20 yellow cards, 16 green card and 24 blue cards. what is the probability that a blue card is chosen at random

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.