For 13-17 The average IQ is 105 with a standard deviation of 15. Use the Empirical rule (68,95,99.7 rule page 86).to answer the following questions 13. Half of all IQ's are lower than what number 14. Only about 5% IQ's are outside the range 15. What IQ would be considered abnormal? 16. Standardize an IQ of 125