For Exercise 1.70, see page 40; for 1.71 to 1.73, see pages 41-42; for 1.74 to 1.77, see pages 44-45; for 1.78, see page 46; for 1.79 and 1.80, see page 49; for 1.81 and 1.82, see page 50; and for 1.83 and 1.84, see page 53.

Question 1.80

1.80 Find the proportion.

Use the fact that the ISTEP scores are approximately Normal, . Find the proportion of students who have scores between 500 and 650. Use pictures of Normal curves similar to the ones given inExample 1.35 (page 47) to illustrate your calculations.