1.31 IQ test scores. Figure 1.15 is a stemplot of the test scores of 78 seventh-

Question

1.31 IQ test scores. Figure 1.15 is a stemplot of the test scores of 78 seventh-grade students in a rural midwestern 21 school IOSCORES (a) Four students had low scores that might be considered outliers. Ignoring these, describe the shape center, and spread of the remainder of the distribution. 7 2 4 7 79 8 69 9 o 1 33 9 67 78 10 2 2 3 3 3 3 4 4 10 5 55 66 67 77 789 11 O O O O 1 1 1 1 2 2 2 2 3 3 3 4 4 4 4 11 55 68 89 99 12 3 3 4 4 12 67 7888 13 O 2 FIGURE 1.15 The distribution of IQ Scores for 78 seventh-grade students, for Exercise 1.31

Explanation / Answer

(a) ignoring four observation 72, 74,77, and 79 the

shape : symetrical

centre:111 (median value)

spread=maximum -minimum=136-86=50

(b) out of 78 , 62 are having scores above 100

so its percentage=100*62/78=79.49

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