In a standard normal distribution, the mean is at the center, which is 0, and standard deviations are measured from the mean. To the right of the mean, the convention is to mark 1, 2, or 3 standard deviations.
Therefore, the options that represent how many standard deviations are marked to the right of the mean in a standard normal distribution would typically be:
- 1 standard deviation (not listed in your options)
- 2 standard deviations (option: 2)
- 3 standard deviations (option: 3)
So, among the choices given, both 2 and 3 are correct answers for how many standard deviations are marked to the right of the mean, but it's common to reference the first few, so "3" is typically the outer most for reference in discussions.
If you must select only one from the choices given, "3" is commonly marked as the furthest right standard deviation to visualize how far out the curve extends.