Mississippi Stud / how to calculate odds

Ok, so I found the probability chart for Mississippi stud, but I don't know how to read it in "everyday" terms.

For one thing, if a probability shows as, say, 0.000054 - how do I translate that into something basic, such as, "the odds of getting 4 of a kind are 1 in _____?" That's my main question.

Next, looking at the chart - why does it have four of a kind listed more than once, and with different odds?
I'm currently in Biloxi, so I might be hitting a casino and giving it a shot tonight. The last time I played, the guy next to me hit four of a kind. 20 minutes later, his wife hit it. An hour later, he hit it again. I'm sure that's certainly not typical, but I've seen decent wins occur more frequently at those tables. That's also why I'm curious as to the odds of getting four of a kind.

Quote: heyimjason

if a probability shows as, say, 0.000054 - how do I translate that into something basic, such as, "the odds of getting 4 of a kind are 1 in _____?"

0.000054 = 54/1000000.

To get that to 1 in 18518, you divide 1000000 by 54.