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A mean is an arithmetic average of a set of observations. The increase in the mean for the second week compared to the first is 0.4.
<h3>What is Mean?</h3>A mean is an arithmetic average of a set of observations. it is given by the formula,
Given the spending in the first week is $12.99, $10.50, $9.89, $6.90, and $7.58, therefore, the mean will be,
Also, the spending in the second week is $2 more than the total of the first week, therefore, the mean will be
Hence, the increase in the mean for the second week compared to the first is 0.4.
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