Teacher/User Name: DEMO Name:__________________________ Practice ProblemsBy Easy Worksheet Period: ________ Date: ____________

### Solve:

1) There were 530 Algebra grades normally distributed with a mean of 63 and a standard devation of 12.1. We know that 14 students received a grade of A. What is the minimum score needed to recieve an A?

By Easy Worksheet

By Easy Worksheet

By Easy Worksheet

By Easy Worksheet

2) There were 570 Physics grades normally distributed with a mean of 75 and a standard devation of 12. We know that 13 students received a grade of A. What is the minimum score needed to recieve an A?
3) There were 510 Geometry grades normally distributed with a mean of 63 and a standard devation of 11.4. It is known that 208 students received grades of C or better. What was the minimum score of those who received a C?

By Easy Worksheet

By Easy Worksheet

By Easy Worksheet

By Easy Worksheet

4) There were 400 Geometry grades normally distributed with a mean of 60 and a standard devation of 11.3. It is known that 61 students received grades of B or better. What was the minimum score of those who received a B?