A set of test scores has a mean of 50, a median of 50 and a mode of 50. Most scores are between 40 and 60. Very few scores are below 30 or above 70.
Outline three characteristics of a normal distribution shown by these data.
56 exam-style questions on Oxford AQA IGCSE Psychology 1.5 Data handling, covering 1.5.1 Quantitative and qualitative data, 1.5.2 Primary and secondary data, 1.5.3 Mathematical expressions, 1.5.4 Measures of central tendency and range, 1.5.5 Frequency tables and diagrams, 1.5.6 Charts for data display, and 1.5.7 Normal distribution. Each one has a worked solution and a mark scheme showing where the marks go.