GCSE Secondary Maths Age 13-17 - Probability & Statistics: Mean and Mode - Explained

The video tutorial explains how to analyze a table of foot lengths for 40 adults. It covers identifying the modal class interval and estimating the mean foot length using mid values. The tutorial provides a step-by-step calculation of frequency and mean, emphasizing the importance of understanding grouped frequency tables. It concludes with a discussion on marks allocation for the question.

What is the modal class interval in the given data?

• 16 ≤ F < 18

• 18 ≤ F < 20

• 22 ≤ F < 24

• 24 ≤ F < 26

Why do we use mid values when estimating the mean?

• To simplify the calculation

• To account for unknown exact measurements

• To increase accuracy

• To reduce the number of calculations

What is the mid value for the interval 18 to 20?

• 18

• 19

• 20

• 21

How is the total of all frequency multiplied by data (FX) calculated?

• By dividing the total frequency by the number of intervals

• By multiplying each frequency by its mid value and summing the results

• By averaging all mid values

• By adding all mid values

What is the estimated mean foot length of the adults?

• 20.5

• 21.9

• 22.3

• 23.1