What is Noah’s mean absolute deviation?

StartFraction StartAbsoluteValue 87 minus 84 EndAbsoluteValue + (2) StartFraction StartAbsoluteValue 87 minus 85 EndAbsoluteValue + StartFraction StartAbsoluteValue 87 minus 86 EndAbsoluteValue + StartFraction StartAbsoluteValue 87 minus 90 EndAbsoluteValue + StartFraction StartAbsoluteValue 87 minus 92 EndAbsoluteValue over 6 EndFraction = StartFraction 3 + 4 + 1 + 3 + 5 over 6 EndFraction
1.33
2
2.67
3.5

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?