Upload a file with your answers to this question. Your upload MUST be ONE FILE. 1) (1 point)
In a normal distribution, what proportion of scores fall between z= -1.25 and z= 2.75. (Sketch the
distribution to show your work).
2) (1 point)
Intelligence quotient (IQ) scores are normally distributed with a mean of 100 and a standard
deviation of 15. If everyone I meet claims that their IQ is above 145, should I feel skeptical about the
likelihood that most people have IQs at this level?
Explain your answer by drawing the sketch and describing the proportion of people with IQs
above 145.
3) (1 point)
In her math class, Kim received a 75 on her test (mean for the class was 80 and standard deviation
was 3). Her friend Pat took a test on the same day in her english class and earned a 60 (mean for the
class was 55 and standard deviation was 2). Kim is bragging that she did better relative to her
classmates than Pat because her score was higher. Is she correct?
Explain your answer by providing sketches and z-scores.