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Topic - Probability question

Foxache - on 17 Sep 2013
I'm hoping that one of the more mathematically-minded UKC members can help me with this question, as although I can do speling and gramer good, I'm pretty hopeless at maths:

There are 900 people working in a mine during a given year and their hours spent underground are logged. It's calculated that for every 400 hours spent underground, one miner is killed in a mining accident.

Miner A spent 400 hours underground
Miner B spent 800 hours underground
Miner C spent 1,200 hours underground
Miner D spent 1 hour underground

What was the probability of each being killed?

I'm thinking:

Miner A = 1 in 900
Miner B = 1 in 450
Miner C = 1 in 300
Miner D = 1 in 360,000

Is that correct?
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