A random sample of house size in major city has a smoke mean of X=1204.9 sq ft and sample standard deviation of s=124.6 sq ft. Use the emphirical rule to determine the approximate percentage of hise sizes that lie between 955.7 and 1454.1 sq ft.

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)