Problem 7 The Wechsler Adult Intelligence Scale is standardized to have a mean of 100 and a standard deviation of 15. If we draw a random sample of 25 people from the population, what is the probability of obtaining (a) a sample mean with an IQ of 95 or less? (b) a sample with a mean IQ of 105 or greater? (c) finally, what two IQ scores would border the middle 95% of the distribution?.