75.3. What proportion of the normal distribution is found in the foilowing Ra; ' a. Between the mean and z = .121 "' 13. Beyond 17. = .55 c. Between the mean and z \"1!;'2.0'1 7.12. In a school district of 4000 students how many would be expected to have f... IQs of 70 or less? 7.13. What proportion of the population would be expected to have IQs of 110 or higher? 7.14. Answer the following questions for 250 rst-grade students. a. How many would you expect to have 1le of 110 or higher? R's). How many would you expect to have IQs lower than 110? c. How many would you expect to have IQs lower than 100? '7 15. Mensa IS an organization of peopl nth 1. . 5o be e\" 1. for membership, a person must hay " '5 liter than 98 percent of the population.\" What IQ 15 required toqualtfy ',1 1 1 1 1 5' 11:} I 5 \"[1 .21." *7.19. The distribution of 800' test scores In' 2112 introduction to psychology course \"a 1'1: 111 was approximately normal with p. 35 and 0"\" 622 5 ' ,. 1 1 a. What proportion of the students had 5 scores. between 30 and 40'? 5 b. What 1s the probability that a randomly selected student wouid score 5 between 30 and 40'? 5' 1.1 11; x, 1 5 1 1 . ~ 1 "\"J -2...- 7.21. Calculate the proportion of scores between 20 and 30. Be careful with this one, drawing a picture is especially advised. 7. 22. How many of the 800 students would be expected to have scores between 20 and 30