math help

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Please help me on these I have lost the tables that I would need to answer them or at least the ones I think are used.
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. .

(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.

  • math help -

    Never mind with the help, I tried for a week and no one would help, just skipped my questions. But thanks

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