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## A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

student : Q1 New spark plugs have just been installed in a small airplane with a four-cylinder engine. There is one spark plug per cylinder, so four spark plugs have just been installed. For each spark plug that is defective and will fail during its first 20min of flight is 1/10000, independent of the other plugs. A) If only one spark plug fails, the plane will shake and not climb higher, but it can be landed safely. What is the probability that this happens( show all working out)? B) If two or more spark plugs fail, the plane will crash. What is the probability that this happens?(show working out.
tutor2 : pls. wait.
tutor2 : A) P(probability that this happens i.e one plug fails) = 1/10000
tutor2 : Please note, due to lack of resources, we can only do 1 problem FREE in 24 hours period. You can always come back tomorrow for another free problem. Please, tell your friends about our free service - 1 free in 24 hours
student : thanks

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