1. What is the probability that a quality control result from a normal distribution will fall within +1 standard deviation from the mean? 2. The mean value for cholesterol is 224 mg/dl. The laboratory has determined that the standard deviation is 4 mg/dl. Calculate the standard deviation ranges for the following: a. t1 standard deviation: b. +2 standard deviations: C. t3 standard deviations: 3. Use the data set to answer the following questions: 23, 24, 25, 23, 25, 26, 25, 27, 28, 24, 25, 23, 25 a. Compute the mean value. b. Compute the median value, c. Compute the mode value. d. Compute the variance value. e. Compute the standard deviation. f. Compute the standard deviation range for t1 standard deviation.