1. The Wechsler Adult Intelligence Scale (WAIS) is a commonly used intelligence test that is calibrated to produce a Normal distribution of scores with = 90 and = 10 for various age groups. Based on 68-95-99.7 rule, calculate the range of the middle 95% of scores.
   1. 50 to 90
   2. 60 to 120
   3. 80 to 100
   4. 70 to 110
   5. 100 to 150