2006 iTest Problems/Problem 2
Problem
Find the harmonic mean of 10 and 20.
Solution
The harmonic mean of two numbers is the reciprocal of the mean of the reciprocals of the two numbers. The reciprocals of and are and and the mean of the two is , so the harmonic mean is .
See Also
2006 iTest (Problems, Answer Key) | ||
Preceded by: Problem 1 |
Followed by: Problem 3 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 • U1 • U2 • U3 • U4 • U5 • U6 • U7 • U8 • U9 • U10 |