Random Number Based on Chances of Happening

I have 5 numbers which are 1, 2, 3, 4 and 5.

Number 1 has a 80% chance of occurring. Number 2 has a 10% chance of occurring. Number 3 has a 8.5% chance. Number 4 has a 1% chance and Number 5 has a 0.5% chance.

What formula do I need to randomly choose one of my numbers (1, 2, 3, 4 or 5) based on the likelihood of them occurring?

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Try the above formula

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