This math topic focuses on understanding how adding a specific number to a set of data points affects the mean. The problems provide sets of numbers and specify how the mean should change (increase or decrease by a fixed amount). Students are required to determine which number, from a set of multiple choices, can be added to the original data so that the desired mean change occurs. This involves using concepts from probability and statistics, particularly focused on calculations involving the mean, and enhances relational understanding between data changes and average outcomes.
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What number can be added for these numbers to have the given change in their mean
1, 9
mean increases by 3