If the number of inhabitants is given in units, then divide the number by the number of inhabitants and multiply by a million (106). If the number of inhabitants is given in millions, then simply divide the number by the millions of inhabitants
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Divide by the number of hours per year that you claim to work for.
parts per million = ppm
3 Sigma is 66800 defects per million pieces 6 Sigma is 3-4 defects per million pieces You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion chart in the related links section
"ppm" means "parts per million". It's a ratio of two numbers that both have the same unit, so the ratio has no unit. It could be ounces per million ounces inches per million inches seconds per million seconds people per million people . . etc.
There are 18 murders per 100,000 inhabitants each year.