Find the missing value. cos(x) =7/14

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.

How do you solve this step by step?