The lifetime of bacteria follows the Weibull distribution. The probability that the bacteria lives for more than 10 hours is 0.6 and that it lives more than 20 hours is 0.3. We want to find the probability that among 300 bacteria more than 200 live longer than 10 hours. Which of the following works best to compute this?

a) P(XN < 200; Mu = 180, Sigma = 180)

b) P(XB > 200; p=0.6, n=300)

c) P(XB > 200.5; p=0.6, n=300)

d) P(Tw > 10; a and b to be computed from data