A Sample of University Students Has an Average GPA of 2.78

A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45.If GPA is normally distributed,what percentage of the students has GPAs
$\begin{array}{|l|l|l|l|l|}\hline & & Z \text { score } && \text { Area } \\\hline \text { a. } & \text { less than } 2.30 ? & & & \\\hline \text { b. } & \text { Less than } 2.00 ? & & & \\\hline \text { c. } & \text { more than } 2.00 ? & & & \\\hline \text { d. } & \text { more than } 3.00 ? & & & \\\hline \text { e. } & \text { between } 2.50 \text { and } 3.50 ? & & & \\\hline \text { f. } & \text { between } 2.00 \text { and } 2.50 ? & & & \\\hline & & & & \\\end{array}$