− 4x − 7y = 15 4x − 2y = − 6
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Using the given information, the value of Σfd is 800
<h3>Calculating mean using Assumed mean </h3>From the question, we are to determine the value of Σfd
The formula for mean, using the assumed mean method is given by
Where is the mean
A is the assumed mean
From the given information,
Putting the parameters into the equation, we get
Hence, the value of Σfd is 800
Learn more on Mean here: brainly.com/question/20118982
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