Answer
At least 75% of gasoline stations had prices between $2.94$ and $3.18$.
Work Step by Step
Put k = 2:
x̅ - ks = 3.06 - 2 (0.06) = 2.94
x̅ + ks = 3.06 + 2 (0.06) = 3.18
Using Chebyshev's inequality for k =2:
$(1−1/(2)^2)=75\%$
Thus, at least 75% of gasoline stations had prices between $2.94$ and $3.18$.
