What is the equation of the blue line

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

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%

Can someone me do math because i am having a breakdown rn because i don’t get it