Let’s consider the manufacturing setting and, specifically, the pen industry. The quality control supply chain analyst w

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Let’s consider the manufacturing setting and, specifically, the
pen industry. The quality control supply chain analyst would like
to evaluate, with a level of confidence equal to 90%, where the
average number of pens produced per hour can be found. Assume that
the pen production is normally distributed and that, based on a
sample of 24 hours, the average number of pens produced per hour is
275 with a variance of 15. Please compute the lower limit [2 marks]
and upper limit [2 marks] of the requested confidence
interval.