Question

The local authorities in a city install 10,000 bulbs in the streets of the city. If these lamps have an average life 1,000 burning hours with a standard deviation of 200 hours, assuming normality, what number of bulbs might be expected to be fail (i) in the rst 800 burning hours? (ii) between 800 and 1,200 burning hours? After what period of burning hours would you expect that (a) 10% of the lamps would fail? (b) 10% of the lamps would be still burning?

Answer 1

Answer:

these lamps have an average life of 1,000 burning hours with a standard deviation of 200 hours, assuming normality, what number ...

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... VARIABLES. A discrete random variable X has the probability function given below ... (a) If the density function of a continuous R.V.X is given by ..... (i) in the first 800 burning hours.

Answer 2

Answer:

(a) and (b) section answer is needed