Mrs. alberts has taught seventh grade math for thirty years. every year she calculates and records the class average on the final exam. the following dot plot represents these average scores from the past thirty years.
calculate the mean of the average scores and round this value to the nearest whole number. then, calculate the mean absolute deviation of the scores (using the rounded mean) and round it to the nearest whole number, as well. express your answer as a numerical value.
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what percent of the scores lie within one mean absolute deviation (either way) of the mean? round to the nearest percent and express your answer as a numerical value.
note: use the rounded mean and mean absolute deviation. %

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.