- 10
- 12
- 15
- 17
- 19

Option 3 : 15

Get proficient with the Quantitative Aptitude concepts with detailed lessons on the topic Elementary Statistics among many others.

**Given:**

Variance = 225

**Formula used:**

Variance = (Standard deviation)^{2}

**Calculations:**

Standard deviation = √ Variance

Standard deviation = √ 225

**∴**** The Standard deviation is 15**

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