What would be the required number of readings if the analyst wanted to be 87 percent confident

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What would be the required number of readings if the analyst wanted to be 87 percent confident that the mean observed time was within ±5 percent of the true mean and he established the following values for an element after observing 19 cycles: 0.09, 0.08, 0.10, 0.12, 0.09, 0.08, 0.09, 0.12, 0.11, 0.12, 0.09, 0.10, 0.12, 0.10, 0.08, 0.09, 0.10, 0.12, 0.09?
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Niebels Methods, Standards and Work Design

ISBN: 978-0073376318

13th edition

Authors: Andris Freivalds, Benjamin Niebel

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