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- Suppose the mean IQ for a group of psychopaths is 105 and the standard deviation is 7. Assuming a normal distribution, determine:
a) the percentage of IQ scores between 100 and 110.
b) the probability of selecting a psychopath at random who has an IQ between 100 and 110.
c) the percentage of IQ scores between 90 and 105.
d) the probability of randomly selecting a psychopath who has an IQ between 90 and 105.
e) the percentage of IQ scores that are 125 or above.
f) the probability of randomly selecting a psychopath who has an IQ of 125 or above.
g) the probability of randomly selecting two psychopaths who both have an IQ of 125 or above.
h) 95 percent of the scores are lower than what score.
i) 95 percent of the scores are between what two scores.