5 cm
8 cm
10 cm
6 cm
15 cm
Find the missing side length

Can someone me out here number 4 plz

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 strategy is used by public health to reduce the incidence of food poisoning?