Answer:
The mode is the number that appears most frequently in a data set. A set of numbers may have one mode, more than one mode, or no mode at all. Other popular measures of central tendency include the mean, or the average (mean) of a set, and the median, the middle value in a set.
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Your question is a bit confusing since i don't know which sentences are which, but it might be this:
Answer: 1.
1. Jax hadn't
2.as far as I'm aware already seen the movie before we went to see it together.
There is no info on this, could you give me some info so i could answer it
formal; ordinary
definitely not slang