The willamette river is about 25% as long as the Columbia river. the willamette river is 309 miles long. find the length of the Columbia river .

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.