Joe smith scored 37 of his teams 100 points in a game. What percentage of points did he score?

Which one ? is the answer and how to find this answer

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%

How can (square root of 25) ^2 be rewritten?