Answer:
Betewen 9 and 49, the arithmetic mean is 29.
I have two ideas for a solution:
1.) Calculate An = A1 + (n-1) d using the formula An = A
An = A1 + (n-1) d
A3 = 9 + (3-1) d
49 = 9 + 2d
49 - 9 = 2d
40 = 2d
40/2 = 2d/2
20 = d
A1 + d = A2
9 + 20 = A2
29 = A2
2.) Using this method: Add the two terms and divide by two (applicable only when just one arithmetic mean needs to be obtained).
9 + 49 = 58
58/2 = 29
The procedure is similar to... determining the average value, often known as the "mean" or "middle."
To calculate the mean/average, put all of the numbers together and divide by the total number of numbers.
