Heather's age is 3 years more than half her cousin rachel's age. if the difference in their ages is less than 4 years, what is the oldest that rachel can be in years?

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.