A homeowner has just installed 20 light bulbs in a new home. suppose that each has a probability 0.2 of functioning more than three months. what is the probability that at least ve of these function more than three months? what is the average number of bulbs the homeowner has to replace in three months?
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according to question
Total number of bulbs = 20 bulbs
and
probability of 1 bulbs for 3 months = 0.2
Thus
Probability of 20 bulbs for 3 months
P' = 0.2 * 20
= 4
Total number of bulbs = 20 bulbs
and
probability of 1 bulbs for 3 months = 0.2
Thus
Probability of 20 bulbs for 3 months
P' = 0.2 * 20
= 4
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