For a Bingham plastics, there is a yield stress ${}_y$ that must be overcome before flow begins as shown in the equation

$={}_y+$

where

$=$ shear stress, $=$ rate of shear strain, and $=$ vis $cos$ ity

a$)$ Using the following data, find the yield stress and viscosity

b$)$ Using a $95\%$ confidence interval, what is the range of yield stress

$\backslash$table$[[(\frac{N}{m^2}),3\mathrm{.}57,3\mathrm{.}89,4\mathrm{.}96,5\mathrm{.}62,6\mathrm{.}13],[(\frac{1}{s}),1,2,3,4,5]]$