What is the value of the 2 in the number 28

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

What is the prime factorization of 23 ?me with this question

Pls never taught i’m really confused and i rlly need