statistic margin of errors

label Statistics
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

i cant figure out how my example comes out with this answer

1.860*25/sq 9= 15.5

when i calculate i get a different answer.

May 28th, 2015

please paste a complete question with statement......................

May 28th, 2015

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May 28th, 2015
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May 28th, 2015
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