Digital SAT Math Practice Question #2510
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Desmos / Statistical Reason: Filter conditional probability denominators carefully — 'out of what total' is always the key.
Let $n$ be original count: sum $= 10n$. New mean: $\frac{10n + 15}{n + 1} = 11 \implies 10n + 15 = 11n + 11 \implies n = 4$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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