We will say that an examination is good if the test scores can be approximated by a normal density function. A letter grade of A is assigned if a test score is above u to, B if the score is in (#, uto), C for (u-o, u), D for (u-20, u-o), and F if the score is below -20. Approximate the probability that a student scores an A on a good examination. Round Your answer to two decimal places