What does Chebyshev's theorem say?
(Is the standard deviation 12 or 21?)
The mean amount spent by all customers at an organic food market is estimated to be $48, and the standard deviation is estimated to be $12. According to Chebyshev's Theorem, at least what percentage of customers would be expected to spend between $27 and $69? Express your answer to two decimal places and show step by step work
im lost