Can you help me figure out how to find a-score. This is a example. Having hard time figuring how to find the s score

Z = 0.33 The correct answer is: 0.33 A group of apples from a particular grower were found to have diameters with a mean of 69.0 mm and a standard deviation of 3.8 mm. It is expected that 80% of apples will have diameters larger than out Select one: O a. 72.0 mm O b. 65.8 mm c. 72.2 mm X O d. 72.8 mm Using a z-score table or technology, determine that -0.84 is the z-score over which 80% of data lies. Z= x- ul -0.84 = X - 69.0 3.8 -3.192 = X - 69.0 65.8 = X The correct answer is: 65.8 mm