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How do we decide if 中 is ちゅう or じゅう ?

For example, in this sentence １０人中３人はビデオを持っている which pronunciation should we
use?

What about this: そのピアニストの演奏中、彼らは一心に耳を傾けた。
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2011-08-22T05:07:31.187
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2020-09-19T15:49:45.523
2011-12-29T05:53:15.373
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question
words pronunciation
How do we decide if 中 is ちゅう or じゅう?
"out of" is 「ちゅう」, "through" is 「じゅう」.

> 中 ちゅう  
>  (suf,abbr,n-suf) medium; average; middle; moderation; middle school; China;
> in; out of (e.g. three out of ten people); during (a certain time when one
> did or is doing something); (P)  
>  中 じゅう  
>  (suf) through; throughout; in the course of; all over or throughout (e.g. a
> place)

**EDIT:**

That second example is "during", so 「ちゅう」.
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2011-08-22T05:15:43.380
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2011-08-22T05:22:56.510
2011-08-22T05:22:56.510
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* **じゅう** (or, rarely: ぢゅう) is used for expressions covering a **length** of time (resp. area) from start to finish, in its entirety. I.e. "through", "all of":

> 一年中【いちねんじゅう】 all year
>
> 一日中【いちにちじゅう】 all day
>
> 世界中【せかいじゅう】 all over the world

  * **ちゅう** is for pointing a particular time (resp. specific location) out of an interval (resp. general area). I.e. "out of", "during":

> 午前中【ごぜんちゅう】 [at some point] during morning
>
> 会議中【かいぎちゅう】 in a meeting [e.g. "he is in a meeting _at the moment_ "]

Note that in some cases, both can be used and the only way to tell would be
from context (e.g. an expression followed by に is more likely to be ちゅう) or in
speech:

> 来月中【らいげつじゅう】 all of next month
>
> 来月中【らいげつちゅう】 [some time] next month
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2011-08-22T05:37:22.120
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2018-10-21T03:03:12.413
2018-10-21T03:03:12.413
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answer
１０人中３人はビデオを持っている

Here, 中 reading is うち
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2020-09-19T15:49:45.523
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2020-09-19T15:49:45.523
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answer