Assume that a sample is used to estimate a population mean. find the 80% confidence interval for a sample of size 755 with a mean of 51.4 and a standard deviation of 8.7.

Which fraction below is equivalent to 10/12?

What is 20+(5 x 2/5 )+ 3 show your work

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).