If you assume that an Extraversion Test is normally distributed, with an average of 50 and a standard deviation of 5, what percentage of people will have an IQ between 40 and 60? A) 34% B) 95% C) 68% D) 99.7%
Added by Encarnacion B.
Step 1
For X = 40: z = (40 - 50) / 5 = -2 For X = 60: z = (60 - 50) / 5 = 2 Show more…
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