Mathematics · Statistics
Machine A cuts rods whose mean length is 10 cm with a standard deviation of 3 mm. Machine B cuts rods of mean length 20 cm with a standard deviation of 4 mm. Rods of 30 cm mean length are made, each by joining one rod from each machine. The standard deviation in the length of the joined rod is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 13.5 mm
- 25 mm✓
- 37 mm
- 410 mm
Correct answer
5 mm
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