I need help answering these questions

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%

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.

What ia the sum if the first 7 terms of the geometric series