5. An electrical company has developed a new form of light bulb that it claims lasts longer than current models. The company has 1 million bulbs in its inventory. Consider the population average lifetime.
1.99.5
(a) Turn on all 1 million light bulbs, leave them all on until they burn out, compute the average of all bulb lifetimes. (b) Use the average lifetime of a sample to estimate the average lifetime of the population.