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The maximum (stated) load of a passenger lift is 8 passengers or 600 kg. If the masses of people using the lift can be considered

The maximum (stated) load of a passenger lift is 8 passengers or 600 kg. If the masses of people using the lift can be considered to be normally distributed with mean 70 kg and standard deviation 15 kg, how often will the combined mass of 8 passengers exceed the 600 kg limit?

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