Light bulb burn time data

A quality engineer wants to assess the life span of the light bulbs that a company manufactures. The engineer collects a random sample of 100 bulbs and records the burn times to failure. The engineer wants to calculate the lower tolerance bound (which is the burn time that at least 95% of all light bulbs exceed).

You can use this data to demonstrate Tolerance Intervals (Normal Distribution).

Worksheet column Description
Hours The light bulb burn times in hours