Interpreting Percentiles In Exercises 29–32, use the ogive, which represents the cumulative frequency distribution for quantitative reasoning scores on the Graduate Record Examination in a recent range of years. (Adapted from Educational Testing Service) Quantitative Reasoning Scores 100 90 80 70 60 50 d 40 30 20 10 134 138 142 146 150 154 158 162 166 170 Score 29. What score represents the 70th percentile? How should you interpret this? 30. Which score represents the 40th percentile? How should you interpret this? 31. What percentile is a score of 140? How should you interpret this? 32. What percentile is a score of 170? How should you interpret this? Percentile

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.