k = 20
R_sum = 0.0165 ## Read from Table 6.5 EPage 150
R_bar = R_sum / k
print(R_bar) ## Matches the value for R-bar in the table above

n = 5

sigma_xbar = 0.000756 ## read from EXAMPLE
sigma_x = sigma_xbar * sqrt(n)
print(sigma_x)