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Misalnya, ketika kumpulan data adalah {5,20,40,80,100}

Total input (n) = (5,20,40,80,100)
Total input (n) = 5
Rata-rata (xm) = (x1 + x2 + x3 ... xn) / n
Berarti (xm) = 245/5
Berarti (xm) = 49
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Sd =
SQRT (1 / (N-1) * ((x1-xm) ^ 2 + (x2-xm) ^ 2 + .. + (xn-xm) ^ 2))
= SQRT (1 / (5-1) ((5-49) ^ 2 + (20-49) ^ 2 + (40-49) ^ 2 + (80-49) ^ 2 + (100-49) ^ 2 ))
= SQRT (1/4 ((- 44) ^ 2 + (- 29) ^ 2 + (- 9) ^ 2 + (31) ^ 2 + (51)))
= SQRT (1/4 ((1936) + (841) + (81) + (961) + (2601)))
= SQRT (1605)
= 40.06245124802026.
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Menemukan Kesalahan Standar
Kesalahan standar = SD / SQRT (n)
Kesalahan standar = 40.06245124802026 / sqrt (5)
Kesalahan standar = 40.0625 / 2.2361
Kesalahan standar = 17.9165