The IQs of individuals admitted to a state school for the mentally retarded are approximately normally distributed with a mean of 60 and a standard deviation of 10. (a) Find the proportion of individuals with IQs greater than 75. (b) What is the probability that an individual picked at random will have an IQ between 55 and 75? (c) Find probability that individual picked at random has an IQ between 50 and 70.

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