# Hint to Puzzle #38: Probability of Seeing a Car in 10 Minutes & 30 Minutes

38. On a deserted road, the probability of observing a car during a thirty-minute period is 95%. What is the chance of observing a car in a ten-minute period?

To clarify the question we are saying the probability of seeing any other cars in 30 minutes is 95% or more clearly, and more usefully, the probability of not seeing any other cars is 5%.

What is the probability of tossing a coin and getting 3 heads in a row?

What has to happen 3 times in a row in order that you do not see a car for 30 minutes?

Where next?

Questions Answer

© Nigel Coldwell 2004 - – The

**questions**on this site may be reproduced without further permission, I do not claim copyright over them. The

**answers**are mine and may not be reproduced without my expressed prior consent. Please enquire using the link at the top of the page.

__PayPal__

I always think it's arrogant to add a donate button, but it has been requested. If I help you get a job though, you could buy me a pint! - nigel