Use the standard normal distribution table to find the z score that has a cumulative area from the left of 0.97. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. Subtract highest z score from 2nd z score 6.3.9įind the indicated IQ score. 7486 = area of shaded region (for when graph has 2 numbers)ĭo everything for both numbers To find the area under a curve that is between the 2 z=#'s 6 in the standard normal distribution table - look acroos columns until you # below. The shaded region in the graph to the right is the area to the left of 0.67 in a standard normal distribution with a mean of 0 and a standard deviation of 1. (graph has 110 indicated as shaded area( x=110 (for when graph only has 1 number)įind the area of the shaded region. Standardizing the scores to z scores makes the distribution a standard normal distribution. What are the value of the mean and standard deviation after all IQ scores have been standardized by converting them to z scores using z=(x-μ)/σ ? The mean is 0 and the standard deviation is 1. TERMS IN THIS SET (17) The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15.
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