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Big lotteries like the UK national lottery and Euromillions advertise ‘estimated jackpots’ each week. For example, this week the estimated jackpot for Euromillions is £38m (wow!)
Premise 1:
When there is an unsually large pot on offer (e.g. a ‘rollover’), more people are likely to buy a ticket.
Premise 2:
If a larger than usual number of people buy tickets, there will be a larger than usual prize fund.
Conclusion:
The jackpot will be larger than estimated.
Minnie