SEQ014 · Sequences & series · Classes 9–11
Arithmetic mean
The arithmetic mean of a and b is the number halfway between them; a, AM, b form an AP.
(a + b)/2Arithmetic mean
📐 Formula
AM = (a + b)/2
✏️ Worked example
AM of 4 and 10 = 7, and 4, 7, 10 is an AP.
🌍 Where it is used
Averages of marks, temperatures and prices.
❓ Quick check
AM of 6 and 14?
🏋️ Practice
EasyAM of 3 and 11?
Answer: 7
MediumInsert 2 arithmetic means between 2 and 11.
Answer: 5, 8
ChallengeAM of a and b is 9, a = 5. b = ?
Answer: 13