during the repair of a large number of car engines, the spark-plugs were changed in 70% and the air-filter in 45% of case, and that both parts were changed 31.5% of case so
- is the replacement of spark-plugs independent of the replacement of the air filter? and reason ?
-find the probability that in repairing an engine for which the spark-plugs have been changed it with also be necessary to replacement the air-filter?

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air-filter be event B*

\[P(A) \times P(B)=0.7\times 0.45=you\ can\ calculate\]

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