How many of you guys forgot most of the math we learned

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%

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Charlie tosses five coins.what is the probability that all five coins will land tails up.