= 100 and = 16, the 98th percentile of IQ equals: The z-score for a value of a random variable is the number of standard deviations that x falls from...

= 100 and = 16, the 98th percentile of IQ equals: The z-score for a value of a random variable is the number of standard deviations that x falls from the mean . X - If one of your SAT scores was x = 650, how many standard deviations from the mean was it? Scores on the verbal or math portion of the SAT are approximately normally distributed with mean What percentage of SAT scores was higher than yours?