☰ Year plan · Mathematics

Mean, median and mode

Week 14 · Mean, median and mode of a grouped frequency table · 3 lessons
Answers are for parents and teachers.
1
Classes 0–, 10–, 20–, 30–40 have frequencies 2, 8, 6, 4. Find the mean.
2
Classes 0–, 10–, 20–, 30–40 have frequencies 3, k, 5, 2 and the mean is 20. Find k. (Midpoints 5, 15, 25, 35.)
3
The cumulative values are 0, 6, 16, 34, 40 at 0, 10, 20, 30, 40. Find the median.
4
Frequencies 4, 10, 6 in the classes 10–, 20–, 30–40. Find the modal class and the mode.
5
Eight shops sell a toy at 20 LE and one shop sells it at 100 LE. Which is better to describe the usual price: the mean or the median? Why?