-It is known that the mean is 65 and the standard deviation is 5. There are 55 students in the class. (Round your answers to the nearest whole number.

1a. How many students should receive a C?

1b. How many students should receive an A?

-Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 70 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.)

2a. How many would you expect to be between 160 and 180 cm tall?

2b. How many would you expect to be taller than 166 cm?