math help

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Consider the following. (Give your answers correct to four decimal places.)
(a) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.65.
Incorrect: Your answer is incorrect. .

(b) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 1.93.
Incorrect: Your answer is incorrect. .

(c) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 2.17.


(d) Determine the level of confidence given the confidence coefficient z(á/2) for z(á/2) = 2.41.

Can someone please help with these I have no ideal how to start and I also have missed placed my tables that I think will be needed. Really need help

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