A population of unknown shape has a mean of 3,500 and a standard deviation of 300. a. Find the minimum proportion of observations in the population that are in the range 2,900 to 4,100. b. Determine the maximum proportion of the observations that are above 4,400. c. What statement could you make concerning the proportion of observations that are smaller than 2,600? a. The minimum proportion is %. (Round to the nearest integer as needed.)