A student estimates the number of cells in a tissue sample by counting cells in one small area and multiplying by the number of these areas in the whole sample.
The cells are more crowded near the centre of the sample than near its edge.
Which change would best improve the estimate?
Use the mean count from several randomly selected areas of equal size.
Use the mean count from several centrally selected areas of equal size.
Use the largest count from several randomly selected areas of equal size.
Use the smallest count from several centrally selected areas of equal size.
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.