(a)Calculate the fraction of bulbs in Figure 4-1 expected to have a lifetime greater than 1 005.3...

Question:

(a)Calculate the fraction of bulbs in Figure 4-1 expected to have a lifetime greater than 1 005.3 h.
(b) What fraction of bulbs is expected to have a lifetime between 798.1 and 901.7 h?
(c) Use the Excel NORMDIST function to find the fraction of bulbs expected to have a lifetime between 800 and 900 h.