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Answer the following questions below regarding confidence levels and critical values. [Note: Correct answers are based off the provided z-table on eClass, but Excel can also be appropriately used to simulate the table.] (a) What value of $z_{?/2}$ corresponds to the relatively common confidence level of $95%$ ? (Round your answers to 2 decimal places, if needed.) (b) What value of $z_{?/2}$ corresponds to a confidence level of $53%$ ? (Round your answers to 2 decimal places, if needed.) (c) What is the relatively common confidence level when the value of $z_{?/2}$ is 2.58 ? (Provide an integer value.) $%$ (d) What is the confidence level when the value of $z_{?/2}$ is 2.87 ? (Round your answers to 2 decimal places, if needed.) $%$