Solve the equation
6.5=-3+n

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.

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

We just started the introduction into circles and i have no idea how to do this.