A.
5.3-2²+4:2

b
3+.(4-5)+2.3

d
3.(4-2)+.(5-8)
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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%