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

The video tutorial discusses the dress sizes of 25 women, presenting a frequency table for sizes 8, 10, 12, and 14. It explains how to find the median dress size, identifying the 13th woman in the ordered list. The tutorial then explores the probability of a woman having a shoe size of 7 or a dress size of 14, highlighting a common mistake in probability calculation by not considering overlap between categories. The importance of raw data in accurate probability assessment is emphasized.

How many women have a dress size of 12 according to the frequency table?

• 10

• 12

• 6

• 8

What is the median dress size for the group of 25 women?

• 14

• 10

• 12

• 8

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

• 1/25

• 3/25

• 5/25

• 7/25

Why is Zoe's calculation of the probability incorrect?

• She did not consider the overlap of characteristics.

• She miscalculated the individual probabilities.

• She forgot to add the probabilities.

• She used the wrong total number of women.

What is the correct way to calculate the probability of a woman having either a shoe size of seven or a dress size of 14?

• Add the probabilities directly.

• Subtract the overlap from the sum of probabilities.

• Multiply the probabilities.

• Divide the probabilities by the total number of women.