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Problem 2: 20 points = [5 + 5 + 5 + 5] It is assumed that individual IQ scores (denoted as X) are normally distributed With mean (,u) and standard deviation (0) given as #:100 and 0:15 Use normal table and conversion rule to answer questions below. 1. Find proportion of individuals with IQ score below 109 2. Find a chance that a randomly selected respondent has the IQ score above 103 3. What proportion of individuals would be within the interval (97 S X S 106) 4. What X -value corresponds to z-score equal to 1.28? Solution