Data Handling and Presentation

Meera's marks in three tests are 8, 9, 9 (out of 10). She finds the average: (8+9+9)/3 = 8.67. Then she says "that's wrong — none of my tests scored 8.67". Her brother says an average does not have to be one of the values in the list. Who is right?

The data is: 2, 5, 5, 9. Kabir says the mode is 9, because 9 is the biggest. His sister says the mode has nothing to do with being the biggest. Who is right?

There are two batsmen. Rahul's average is 50, Vijay's is 40. The coach says Rahul will definitely score more than Vijay in the next match because his average is higher. Is the coach's claim sound?

On a bar graph, village A's bar looks twice as tall as village B's. Naina says that means A has twice as many people as B. But the graph's axis starts at 90, not 0, and the real figures are A = 100, B = 95. Who is right?

The school kabaddi team must be picked. Masterji says take the 7 tallest children — tall teams always win. Last year's winning team was tall too. Knowing only this, is Masterji's method sound?

A shopkeeper sold 3 blue pens today and 0 red ones. He says "nobody wants red pens — I'll stop stocking red altogether". His son says 3 sales cannot decide that. Who is right?