Least Count, Vernier Callipers & Screw Gauge
A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50 mm, 5.55 mm, 5.45 mm, 5.65 mm. The average of these four readings is 5.5375 mm and the standard deviation of the data is 0.07395 mm. The average diameter
of the pencil should therefore be recorded as:
Show answer and solution
Answer: (a)
- The readings are given to 0.01 mm, so the result is kept to two decimal places.
- Mean mm; deviation mm
- So the answer is (a) mm.