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QUESTION

A psychologist believes that 80% of male drivers, when lost, continue to drive, hoping to find the location they seek rather than ask directions.

A psychologist believes that 80% of male drivers, when lost, continue to drive, hoping to find the location they seek rather than ask directions. To examine this belief, he took a random sample of 360 male drivers and asked each what they did when lost. If the belief is true, what is the probability that less than 75% said they continue driving? and  For a sample of 320 male drivers, what is the interquartile range for the sample proportion?

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