6, Using the normal distribution table, find the area under the standard normal curve between the following values: a. z = 0 and z = 2.3 b. z = 0 and z = 1.68 c. z = 0.24 and z = 0.33 d. z = -2.575 and z = 0 e. z = -2.81 and z = -1.35 f. z = -1.73 and z = 0.49