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If positive 5 means that you received $5, then negative 5 would mean you gave away $5. If positive 5 means 5 floors above the ground, then negative 5 would mean 5 floors under ground. If positive 5 means you gained 5 pounds since last week, then negative 5 would mean you lost 5 pounds. Now what do you think ?
It means whatever members of the set you subtract, the answer will still be a member of the set. For example, the set of positive integers is not closed under subtraction, since 3 - 8 = -5
Mean = 6 Mode = 5.
Mean = (9 + 10 + 2 + 5 + 5)/5 = 31/5 = 6.2
Te mean of 5, 5, 1, 1, and 3 is 3.