A standardized memory test has a mean of µ = 100 and a standard deviation of σ = 10. Answer the following questions: a. What proportion of people would score below 87 on the memory test? b. What is the percentile rank for someone who scored a 109 on the memory test? c. What are the scores that separate the middle 20% (10% on each side of the mean) d. What percent of individuals would score between 89 and 115?

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