Arithmetic mean
Sequences, series and the binomial theorem · Mathematics
Study notes
Q: Find the AM of 4, 7, 10, 15. Insert 3 arithmetic means between 5 and 17. Part A: AM = (4 + 7 + 10 + 15)/4 = 36/4 = 9. Part B: d = (17 - 5)/4 = 3. Means: 8, 11, 14. Check: 5, 8, 11, 14, 17 is an AP ✓.