For a normal distribution, use Table A to verify that the probability (rounded to two decimal places)

Question:

For a normal distribution, use Table A to verify that the probability (rounded to two decimal places) within
a. 1.64 standard deviations of the mean equals 0.90.
b. 2.58 standard deviations of the mean equal 0.99.
c. Find the probability that falls within 0.67 standard deviations of the mean.
d. Sketch these three cases on a single graph.