QUESTION 3 Given the confidence interval (5.44, 8.26); what is the mean (2 decimal places) QUESTION 4 The formula to calculate a z-score is z = (x -)/ The formula to calculate x from a z-score is x = + ZO On a Quiz, scores were normally distributed, with a mean of 83 and a standard deviation of 4. What is the probability that a randomly selected person has a quiz score between 85 and 90? (4 decimal places, NOT as a percent)