Answer:
68.965
Step-by-step explanation:
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➷ Standard deviation = 
Substitute the values in:
= 8.1975...
This can be rounded to give an approximate answer of 8.2
The answer is option A.
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➶ Hope This Helps You!
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Answer:
It depends on what shape you have. Here are some formulas for different shapes.
Step-by-step explanation:
Rectangular prism: 2lw + 2lh + 2wh
Cylinder: 2 pi <em>r</em>² + 2 pi <em>rh</em>
Sphere: 4 pi <em>r</em>²
Cone: pi <em>r</em>² + pi <em>rl</em>
Square-based pyrimid: 1/2<em>lp</em> +<em>B</em>
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I hope this helps!