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Very Old Man

Is the age of this very old man statistically believable?

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Into the Exponential Distribution

Get into the exponential distribution through an exploration of its pdf.

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Into the Normal Distribution

Investigate the normal distribution

Discussing Risk and Reward

Stage: 5 Challenge Level: Challenge Level:1

Use a mixture of common sense and mathematics. 
 
Don't forget that risk is a personal preference -- you cannot be 'wrong' if you choose to accept a certain level of risk in an activity (although you might be foolish; but that's a different matter!)