Given the following pairs of z-values, find the area under the normal curve between each pair of z-values. (Round the final answers to 4 decimal places.)       a. z = -1.95 and  z = 0.75       b. z = -1.05 and  z = -0.75       c. z = 1.77 and  z = 2.98       d. z = -2.43 and  z = 1.43             i need help understanding how to solve

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