My iPhone 4s says I'm using more memory than I believe I'm. Why?

I'm trying to get the new update for my iPhone 4s and it says that I do not have enough storage space because it requires 2.5 GB of storage room. I look at my individual usage and I'm not anywhere close to my maximum storage capacity. I do not know why this is happening.

You ios takes 2.8, apps, movies, music, saved info all takes space.

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