8. (a) The Wechsler Intelligence Scale for Children is approximately normally distributed with mean 100 and standard deviation 15. i) What proportion of test takers will score above 1257 What...

8. (a) The Wechsler Intelligence Scale for Children is approximately normally distributed with mean 100 and standard deviation 15. i) What proportion of test takers will score above 1257 What proportion of test takers will score below 907 Pagedofs iii) What proportion of test takers will score between 110 and 1407 iv) What intelligence score will place child in the top 5% of all children? ¥) If normal intelligence is defined as scoring in the middle 95% of all test takers, figure out the scores that differentiate normal intelligence from abnormal intelligence. i) Determine first and third quartiles. What does these values represent?


Extracted text: 8. (a) The Wechsler Intelligence Scale for Children is approximately normally distributed with mean 100 and standard deviation 15. i) What proportion of test takers will score above 125? ii) What proportion of test takers will score below 90? Page 4 of 5 iii) What proportion of test takers will score between 110 and 140? iv) What intelligence score will place a child in the top 5% of all children? v) If normal intelligence is defined as scoring in the middle 95% of all test takers, figure out the scores that differentiate normal intelligence from abnormal intelligence. vi) Determine first and third quartiles. What does these values represent?