t the present time, the noise level per jet takeoff in one neighborhood near the airport is ormally distributed with a mean of 100 decibels and a standard deviation of 6 decibels. ion of jets generates a noise level greater than 105 decibels at takeoff in this neighborh are selected at random, what is the probability that at least 2 will generate noise in exc at least 2 will not generate noise in excess of 105 decibels? gulation is passed that requires jet noise in this neighborhood to be lower than 105 deci Assuming the standard deviation of the noise distribution remains the same, how much noise have to be lowered to comply with the regulation?

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