math help and check

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Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.87.
.44 my answer

(b) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.91.
.45 my answer

  • math help and check -

    To late to get any help, But thanks

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