What is the mean absolute deviation (MAD) of the data set? 2, 5, 6, 12, 15

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Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

An amusement park manager determined that about 23 of all customers would wait in long lines to ride the new roller coaster. which simulation could not be used to answer questions about whether a customer would wait?