(b)20 silicon nitride (Si3N4) samples from the same batch were 3-point bend tested,the results for the fracture strengths are given in Table 1 below.

i)Plot the Weibull graph; ii)Determine the Weibull Modulus (m) and the Characteristic Strength (o) forsilicon nitride from the graph above; iii)Estimate the % probability that a test piece will survive a stress of 750 MN/m²,briefly commenting on the reliability of ceramics in mechanical design.