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C
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⌫
π
e
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\(\div\)
\(\sqrt{\,}\)
\(a^{b}\)
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\(\times\)
\(\frac{a}{b}\)
ln
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cos⁻¹
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sin
sin⁻¹
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tan
tan⁻¹
A student earned these marks on their last 5 exams:$$78, 85, 62, 90, 75$$Find the standard deviation, rounded to 2 decimal places.
\(\sigma \approx\)
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