Suppose that scores on the verbal portion of the SAT among first-year students at a certain university follow a normal distribution. The mean is about 500 and the standard deviation is about 100. Which of the following statements is correct?

a. The probability that a randomly selected student scored between 500 and 600 is about 0.34.
b. John scored 490 and so his score is 10 standard deviations below the mean.
c. Andrew's score is in the 95th percentile, so we know his score is 700.
d. The probability that a randomly selected student scored less than 400 is about 0.05?