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.
1.76 Test scores.
Many states have programs for assessing the skills of students in various grades. The Indiana Statewide Testing for Educational Progress (ISTEP) is one such program.26 In a recent year 76,531, tenth-grade Indiana students took the English/language arts exam. The mean score was 572, and the standard deviation was 51. Assuming that these scores are approximately Normally distributed, , use the 68-95-99.7 rule to give a range of scores that includes 95% of these students.