Deborah and Allison both had good answers to this question.
Allison's link was very good: https://www.thepunctuationguide.com/colon.html
The part after the colon usually helps explain the part before the colon.
In your example, the ":survey" part was probably a link to a survey which found that 47% of new recruits won't stay 10 years.
Your example would not work unless "survey" was a link, because the word survey is not a useful piece of information by itself.
A colon may be used between independent clauses when the second sentence explains, illustrates, paraphrases, or expands on the first sentence. Example: He got what he worked for: he really earned that promotion.
June 27, 2019
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