Help me with 9 please. (a and b)

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

This is different from the first one can someone me

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.