The uncertainty in the period (time per vibration) is the timing least count divided by the number of vibrations measured.

The OCR shows a marker next to option A; in this context the document indicates those terms as being used similarly.

1.2% of 47.7 is approximately 0.5724, which rounds to 0.6, giving 47.7 ± 0.6 cm^3.

Relative errors add: (0.01/15.12)+(0.01/10.15)+(0.01/5.28) ≈ 0.07%+0.10%+0.20% = 0.37%.

Calculation in the solutions gives RD = 5.00 with a percentage uncertainty of ±11%, so 5.00 ± 11%.

For y = k x^a, %Δy = |a| × %Δx, so the error in y depends on the exponent a and the error p in x.

Maximum error is half the least count: half of 1 mm is 0.5 mm.

Mean = 2.604 s; average absolute deviation = (|2.56−2.604|+...+|2.80−2.604|)/5 ≈ 0.1208 s, closest option 0.11 s.

Area error ≈ 2×(Δl/l); so percentage error = 2*(0.01/1.23)*100, matching option C.

When multiplying or dividing, percentage (or fractional) uncertainties of factors are added to give the resultant percentage uncertainty.