Economist wrote:

A string of 10 lightbulbs is wired in such a way that if

any individual lightbulb fails, the entire string fails. If for

each individual lightbulb the probability of failing during

time period T id 0.06, what is the probability that the

string of lightbulbs will fail during time period T?

A.0.06

B.(0.06)^10

C.1-(0.06)^10

D.(0.94)^10

E.1-(0.94)^10

A

OA please.

What if the questions was the probability of failing during the time period T is 0.06 for 9 of the lightbulbs and 0.05 for the 10th lightbulb what is the probablility that the string will fail during time period T

=

(0.06(9) + 0.05)/10

Please comment.

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