Source(s)

BLS Occupational Employment Statistics, National Cross-Industry Estimates [Internet]. Bureau of Labor Statistics; Available from: http://stat.bls.gov/oes/oes_dl.htm

Definitions

SOC 47-5021. Operate a variety of drills�such as rotary, churn, and pneumatic�to tap sub-surface water and salt deposits, to remove core samples during mineral exploration or soil testing, and to facilitate the use of explosives in mining or construction. May use explosives. Include horizontal and earth boring machine operators.

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Rounding Rules

Odds more likely than 1 in 10, such as 1 in 3.42, are rounded to three significant digits. Odds less likely than 1 in 10, such as 1 in 420.4, are rounded to four significant digits. Trailing zeros after the decimal point are dropped for readability, even though they may still be significant.

Odds you'll see: 1 in 4.26; 14.5; 143; 5,230; 433,200

Odds you won't see: 1 in 2.412; 63.042; 425,242c