Use a for$-$loop to create a variable called A$\_99,$ where every element is the product of the two indices from $0$ to $9$ e$.$g$.$ A$\_99[3,2]=6$ and A$\_99[4,4]=16.$

a$.$ Calculate the mean and standard deviation of A$\_99$

b$.$ time your script that creates A$\_99$ takes its mean and standard deviation using $\%\%$timeit