Consider a sample with a mean of 50 and a standard deviation of 4. Use Chebyshev's theorem to determine the percentage of the data within each of the following ranges to the nearest whole number). 12 13. a. 30 to 70, at least 1 o b. 35 to 65, at least c41 to 59, at least d. 37 to 63, at least c. 33 to 67, at least