Cells are unevenly distributed over a microscope slide. A student uses the mean count from several randomly selected areas of equal size to estimate the total number of cells.
Which statement correctly describes this estimate?
It may differ from the actual total because the sampled areas may not represent the whole slide.
It must equal the actual total because the sampled areas were chosen at random across the slide.
It must exceed the actual total because the sampled areas include more than one part of the slide.
It must fall below the actual total because the sampled areas cover only part of the whole slide.
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.