Answer :
Reasoning is not accurate because we cannot take 79.4 and 0.815 has cluster estimates of 8.
Given:
A student estimated the sum 7.95 + 8.11 + 78.5 + 8.05 + 79.4 + 0.815 as: All the numbers begin with a 7 or 8, so use cluster estimation. 8 + 8 + 80 + 8 + 80 + 0.8 = 184.8
7.95 + 8.11 + 78.5 + 8.05 + 79.4 + 0.815
8 + 8 + 80 + 8 + 80+ 0.8 = 184.8
Cluster estimation is used to estimate sums and products when the numbers being added or multiplied cluster near/ close in value to a single number.
Here 79.4 does not cluster around 8
And 0.815 does not cluster around 8
Therefore reasoning is not accurate because we cannot take 79.4 and 0.815 has cluster estimates of 8.
Learn more about the cluster estimate here:
https://brainly.com/question/9405654
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