Suppose that the scores of a reference population on the Wechsler Intelligence Scale for Children (WISC) can be modeled by a normal distribution with mean103and standard deviation15.

Question 1. What is the probability that a child has a WISC score below83.1? (use 4 decimal places in your answer)

Question 2. What is the probability that a child has a WISC score above143.1? (use 4 decimal places in your answer)

Question 3. What is the probability that a child has a WISC score between103and123.0? (use 4 decimal places in your answer)

Question 4. What are the quartiles of WISC scores? ( HINT: First Quartile Q1= Find a WISC score such that 25% of children have scored below that score. Third Quartile Q3= Find a WISC score such that 75% of students have scored below that score)

Q₁=

Q₃=