Edexcel A-Level Physics Arithmetic Means

Review arithmetic means in Edexcel A-Level Physics through repeated readings, mean periods, measured dimensions and mark-scheme rounding rules.

Exam points

calculate a mean from all valid repeated readings before converting totals such as 10T or 5T
round the final mean to the required decimal places, significant figures and physical unit

[Maximum number: 2]

A student used a laser and screen to determine the diameter of a hair. The apparatus was arranged as shown.

Figure for Question C.1.2—Arithmetic means question 1 — Edexcel A-Level Physics AS

The student repeated the procedure using three different lasers. Each laser produced a different wavelength of light.

The student calculated the diameter d of the hair using each laser. He recorded the values as shown.

Table for Question C.1.2—Arithmetic means question 1 — Edexcel A-Level Physics AS

Determine the mean value of d.

Mean value of d=

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C.1.2—Arithmetic means question 1