The first step in selecting a cell phone plan is to decide on a carrier. According to Consumer's report, basic text and talk phone monthly plans follow a bell-shaped distribution (symmetric and unimodal) with a mean of $40 and a standard deviation of $12. Use the Empirical (or the 68-95- 99.7%) Rule to calculate the proportion of such plans that cost between $4 and $52 a month. 0.9735 0.95 0.6335 0.8385