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## Homework Statement

'A dashboard warning light is supposed to flash red if a car’s oil pressure is

too low. On a certain model, the probability of the light flashing when it should is 0.99; 2%

of the time, though, it flashes for no apparent reason. If there is a 10% chance that the oil

really is low, what is the probability that a driver needs to be concerned if the warning light

goes on?'

## Homework Equations

Law of total probability/bayes theorem?

## The Attempt at a Solution

having trouble making a start..