The lifespans, L, of 807 components were measured and the results recorded in Table 5.5. Table 5.5 (a) Calculate the probability that a component has a lifespan of at least 400 days given that it is...

The lifespans, L, of 807 components were measured and the results recorded in Table 5.5.

Table 5.5

(a) Calculate the probability that a component has a lifespan of at least 400 days given that it is still working after 200 days. (b) Calculate the probability of a component failing before reaching 500 days given that it is still working after 300 days.  (c) Calculate the probability of a component failing between 300 and 500 days given that it is still working after 200 days.