A student uses a micrometer screw gauge to measure the diameter of a copper wire at different positions along its length.
The mean of her three measurements is 0.382 mm.
The first two measurements are 0.375 mm and 0.381 mm.
What is the value of her third measurement?
0.374 mm0.374\text{ mm}0.374 mm
0.378 mm0.378\text{ mm}0.378 mm
0.386 mm0.386\text{ mm}0.386 mm
0.390 mm0.390\text{ mm}0.390 mm
47 exam-style questions on OCR GCSE Physics Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.