Hope this helps with the answer to your question:) (sorry I didn't know how to do question 30)
Answer:
z=1.96
Step-by-step explanation:
Using normal distribution table or technology, 97.5% corresponds to z=1.959964, generally denoted z=1.96, or 1.96 standard deviations above the mean.
(above value obtained from R)
A) Always TRue
Both integers are rational, so the sum must be rational