The model represents a polynomial and its factors. An algebra tile configuration. 4 tiles are in the Factor 1 spot: 1 is labeled x and 3 are labeled negative. 2 tiles are in the Factor 2 spot: 1 is labeled x and 1 is labeled negative. 8 tiles are in the Product spot: 1 is labeled x squared, 4 are labeled negative x, and 3 are labeled. Which equation is represented by the model? x2 â€" 2x â€" 3 = (x â€" 3)(x 1) x2 â€" 4x 3 = (x â€" 3)(x â€" 1) x2 2x 3 = (x 3)(x â€" 1) x2 4x â€" 3 = (x 3)(x 1).

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An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e. g. 98.7654). x f(x) 0 1 2 3

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.