Can I get help on this

Question

Suppose the scores of students on an exam are Normally distributed with a mean of 298 and a standard deviation of 63. Then approximately 99.7% of the exam scores lie between the numbers  and  such that the mean is halfway between these two integers.

Answer 1

99.7% is the μ ± 3σ probability. Plug into the equation for the υ and σ given, i.e. μ - 3σ and μ + 3σ