8.73 mm
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Sample size is the number of samples arawn from a population. If you drew 20 samples, your sample size would be 20.
100 cm height 20 kg weight
Interval is the values between 20 - 29; so 23 is within the 20-29 range.
The answer will depend on the units. 20 mm x 8 mm is quite a different size from 20 miles x 8 miles.
You have to find a chart that will indicate the weight per unit of measure for the appropriate rebar size. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.668 X 20 X 5 = 67 lbs. Charts are available throughout the web or at CRSI.org.