The students at a school are voting on their favorite type of music. Charles surveys a representative sample of students to determine for which type of music each student will vote. The results are in the table below.

STUDENT VOTES
Type of Music Number of Votes
Hip Hop 21
Jazz 15
Classic Rock 9
Punk 6
Charles thinks that if all 850 students vote, 355 students will vote for jazz.

By how many students is his prediction off?

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