Answer:
I am not sure because it's it's not my language
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Below is the solution:
(a) <span>x bar = 3.
</span><span>n = 1
</span><span>std = 0.2
</span><span>z value = 1.645
</span>
<span>3 plus/minus 1.645 (0.2/(sqrt1))
</span>
<span>Interval = [3.07, 3.73]</span>
The problem 3 + 6 = 9<span> demonstrates the closure property of real number addition.</span>
Observe that the addends and the sum are real numbers.
The closure property of real number addition states that when we add real numbers to other real numbers the result is also real.
<span>In the example above, 3, 6, and 9 are real numbers </span>
I believe the answer would be A. making a list of ideas