4. Mrs. Sparks is a 9th grade Algebra 1 teacher. She teaches three Algebra 1 courses and all the classes recently took a chapter exam.
Below are the scores.

1. Find the mean, median, mode, and range of class 1, 2, and 3

2. Find the standard deviation of class 1, 2, and 3

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?