The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 258.6 and a standard deviation of 69.4. (All units are 1000 cells/muL.) Using the empirical rule, find each approximate percentage below. a.
What is the approximate percentage of women with platelet counts within 2 standard deviations of the mean, or between 119.8 and 397.4?
b.
What is the approximate percentage of women with platelet counts between 50.4 and 466.8?

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

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?