Question

Use the clustering estimation technique to find the approximate total in the following question. What is the estimated sum of 105, 101, 139, and 78?

Answer 1

105, 101, 139, and 78 all cluster around 100
so estimated sum = 4 * 100
= 400

Answer 2

cluster estimation is to estimate sums when the numbers being added cluster near in value to a single number. it is 100 in this case.

estimate sum = 100x4 = 400