A psychologist measures the IQ of a large sample of adults. The scores form a normal distribution with a mean of 100. Four of the adults score 70, 100, 115 and 140.
Which of these four scores is likely to be the rarest in the sample?
A score of 70
A score of 100
A score of 115
A score of 140
173 exam-style questions on OCR GCSE Psychology 7.3 Analysing Research, covering 7.3.1 Types of Data, 7.3.2 Measures of central tendency, 7.3.3 Other descriptive statistics, 7.3.4 Tables, Charts and Graphs, 7.3.5 Reliability, 7.3.6 Validity and effects on validity, and 7.3.7 Sources of bias. Each one has a worked solution and a mark scheme showing where the marks go.