Y=-3x-1 find slope and y interceapt

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !

Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 which of the following should robert's box-and-whisker plot look like?