Question: How large of a sample should one select to be 86% confident that the sampling error is 10 or less? Assume that the population standard

How large of a sample should one select to be 86% confident that the sampling error is 10 or less? Assume that the population standard deviation is 250.

I am struggling with how to calculate the z value based on an 86% confidence rating as most of the info in the tables are for 60%, 80, 90%, 95%, 97.7%, 99%.

Thank you.

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