Please help!! I'm putting 100

Which expression is equivalent to the expression shown?

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%

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily