3. Students taking an introductory statistics class reported spending an average of $185 on textbooks that semester with a standard deviation of $45. Use the Empirical Rule to answer part a-f. A rough sketch of the histogram looked like: 68% of students spend between 140 and 230 95% of students spend between 95 and 275 99.7% of students spend between 50 and 320 2.5% spent more than $275 ? $185+(2*$45} = $275 What percent spend less than 5140?] More than $140? Suppose textbook costs are not normally distributed. You would then use Chebychevs Rule. i. At least what percent are between $95 and $275 if the distribution of textbook costs is not normal? ii. At most what percent are outside $95 and $275? iii. At least 88.9% are between