. Composite scores on the ACT test for the 2015 high school graduating class had mean 21.0 and standard deviation 5.5. In all, 1,924,436 students in this class took the test. Of these, 205,584 had scores higher than 28, and another 60,551 had scores exactly 28. ACT scores are always whole numbers. The exactly Normal N(21.0, 5.5) distribution can include any value, not just whole numbers. What is more, there is no area exactly above 28 under the smooth Normal curve. So ACT scores can be only approximately Normal. To illustrate this fact, find (a) the percent of 2015 ACT scores greater than 28 using the actual counts reported. (b) the percent of 2015 ACT scores greater than or equal to 28, using the actual counts reported. (c) the percent of observations that are greater than 28 using the N(21.0, 5.5) distribution. (The percent greater than or equal to 28 is the same, because there is no area exactly over 28.)

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Asystem of linear equations with more equations than unknowns is sometimes called an overdetermined system. can such a system be consistent? illustrate your answer with a specific system of three equations in two unknowns. choose the correct answer below. a. yes, overdetermined systems can be consistent. for example, the system of equations below is consistent because it has the solution nothing. (type an ordered pair.) x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 6 b. no, overdetermined systems cannot be consistent because there are fewer free variables than equations. for example, the system of equations below has no solution. x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 12 c. yes, overdetermined systems can be consistent. for example, the system of equations below is consistent because it has the solution nothing. (type an ordered pair.) x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 8 d. no, overdetermined systems cannot be consistent because there are no free variables. for example, the system of equations below has no solution. x 1 equals 2 comma x 2 equals 4 comma x 1 plus x 2 equals 24