C. X = 19 7 = d. X = 3.78 7= e. X = 6.5 7= 2. A normal distribution of scores has a standard deviation of 15. Find the z-scores corresponding to each of the following values: a) A score of 90, where the mean score of the sample data values is 45. Z= b) A score of 75, where the mean score of the sample data values is 35. Z= c) A score of 40, where the mean score of the sample data values is 28, Z=Activity 2 Standard Score or z-Score I. Convert the following to a Z-score, round off your answer to two decimal places. 1. The following scores were obtained as part of a sample with a mean of 11 and a standard deviation of 2.3. For each score, find the appropriate z-score: a. X = 23 Z = b. X = 17 Z = C. X = 19 Z = d. X = 3.78 Z = e. X = 6.5 Z = 2. A normal distribution of scores has a standard deviation of 15. Find the z-scores corresponding to each of the following values: a) A score of 90, where the mean score of the sample data values is 45.\fActivity 1 Areas Under Normal Curve I. Find the area under the standard normal curve. 1. z = 2.28 P(z S 2.28) = P(z 2 2.28) = 2. z = -2.05 P(2 S-2.05) = P(z 2 -2.05) = 3. Z = 0.28 P(z S 0.28) = P(z 2.28) = 4. P(0