Not sure about this

1. 2 Suppose you find that the mean marks obtained by students in your class is 75, while the standard deviation is 5. If there are 500 students in your class, then roughly how many of them scored between 70 to 80, if you assume a bell curve? Suppose you find that the mean marks obtained by students in your class is 75, while the standard deviation is 5. If there are 500 students in your class, then roughly how* many of them scored between 70 to 80, if you assume a bell curve? Choose one of the following answers. My guess will be about half of the class, that is, 250. Must be close to 68% for Mean +/- SD, that is, 340. Maximum students score within that range, so 450. No one scored within that range, as it is too narrow