A florist determines the probabilities for the number of flower arrangements they deliver each day. x 19 20 21 22 23 P ( x ) 0.21 0.23 0.30 0.12 0.14 Find the mean, variance, and standard deviation of the distribution rounded to 4 decimal places.

Which expression gives the area of the triangle shown below

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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?