In a marketing survey, 13 out of 80 participating adults reported that they would like to purchase a new cell phone in the next month. Estimate the number of adults in a community of 7,200 adults who would like to purchase a new cell phone in the next month. Assume that the sample is representative of the population.

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?