7) A psychologist wants to estimate the proportion of people in a population with IQ scores between 80 and 140. The IQ scores of this population are normal distributed with a mean of 110 and a standard deviation of 15. Use the Empirical Rule to estimate the proportion. 9) A psychologist wants to estimate the proportion of people in a population with IQ scores between 80 and 140. The IQ scores of this population are normally distributed with a mean of 110 and a standard deviation. Use the Standard Normal Table to estimate proportion. 10) Why are questions 7 and 9 not identical? 11) The mean of a normally distributed data set is 118 and the stand deviation is 16. a) use the standard normal table to find the probability that a randomly selected data value is greater than 140. b) use the standard normal table to find the probability that a random selected data value is less than 90