GCSE Secondary Maths Age 13-17 - Probability & Statistics: Median, Probability - Explained

The video tutorial explains how to analyze dress size data for 25 women, focusing on finding the median dress size using a frequency table. It highlights common mistakes and provides a step-by-step method to determine the median. Additionally, the video addresses a probability question regarding shoe and dress sizes, clarifying the correct approach to calculate probabilities in overlapping groups.

How many women have a dress size of 10?

• 2

• 6

• 9

• 8

What is the common mistake when finding the median dress size?

• Using the highest dress size as the median

• Finding the median of the dress sizes directly

• Calculating the average of all dress sizes

• Ignoring the frequency of each dress size

Which dress size corresponds to the median in this dataset?

• 10

• 12

• 8

• 14

How many women have a dress size of 14?

• 8

• 6

• 9

• 2

What is the probability of randomly selecting a woman with a shoe size of 7?

• 3/25

• 6/25

• 9/25

• 12/25

Why is Zoe's probability calculation incorrect?

• She assumed the events were mutually exclusive

• She calculated the probability of a single event

• She used the wrong total number of women

• She added probabilities from different datasets

What could be a reason for the overlap in Zoe's calculation?

• The shoe sizes are not recorded accurately

• The same woman could have both a shoe size of 7 and a dress size of 14

• There are more than 25 women in the dataset

• The dress sizes are not evenly distributed