Find each unit rate. Round to the nearest hundredth if necessary. 1. $240 for 4 days can some one help I'm not good at math at alll

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.