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Ch.12 Data Analysis and Probability Alg 1B CC Sec12.1 Organizing Data Using Matrices Matrix – a rectangular arrangement of numbers in rows & columns Plural is matrices Element – each number in a matrix Matrices are equal if they are the same size & the elements in corresponding positions are equal. Add and Subtract Matrices by combining corresponding elements. Ex.1: Find the sum or difference. 5 2.7 3 3.9 4 7 3 2 a. 8 2 11 1 b. 4 3.2 6.5 4 1.5 5 0 3 Why can’t you add or subtract matrices that are not the same size? Scalar Multiplication – multiply each element by a scalar (real-number factor) Ex.2: Find the product. 1 7.1 3 2.4 a. 2 9 0 b. 5 4 4 2 10 Ex.3: Use the weather chart below. a. Which city has the greatest average number of clear days in a full year? b. Which city has the greatest average number of cloudy days in a full year? p713: 9-12, 14-17, 18, 20-22