Question 1 - Page 105 - Tinkering with Mean - Chapter 5 Class 8 - Tales by Dots and Lines (Ganita Prakash II)

Transcript

Question 1 - Page 105 What happens to the mean if a value equal to the mean is included or removed? If you add or remove a number that is exactly equal to the mean, the mean stays the same. Reason Let's use the fair-share idea. Imagine 3 friends share 15 chocolates equally; their "fair share" (mean) is 5 chocolates each. If a new friend joins the group and brings exactly 5 chocolates with them, nobody has to give or take any chocolates to make things equal. The fair share remains exactly 5! Let’s look at dot plot Original Dot plot New Number 11 (= Mean) is added Mean stays the same