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The lifespan of a certain type of product has been investigated. In an experiment with 8 products, the following lifespans were obtained (unit: operating hours). Livslngd = Lifespan Prov nr 1 2 3 4 5 6 7 8 Livslngd 133.2 123.6 115.2 123.1 119.8 | 113.4 128.9 124.2 Consider the measured values as an observed sample from a continuous distribution. Determine a minimum (narrowest) confidence interval for median life expectancy with a confidence level greater than 90% as possible. Also enter the exact confidence level. WWW wwwww WWW