GCSE Secondary Maths Age 13-17 - Probability & Statistics: Estimate of the mean - Explained

The video tutorial explains how to estimate the mean time for runners using a grouped frequency table. It emphasizes the importance of using mid values for calculations, a concept previously encountered in frequency polygons. The process involves calculating mid values for class intervals, multiplying these by their respective frequencies, and summing the results. The mean time is then found by dividing the total by the number of runners. The tutorial also outlines the marking scheme, highlighting common errors such as not using mid values, which can lead to accuracy issues.

What is the final mean time calculated for the 40 runners, and how is it derived?

Why did some students lose marks on this question related to the mid value?