A Lightbulb Company Is Interested in the Lifespan of Their

Short Answer

A lightbulb company is interested in the lifespan of their lightbulbs.They have 20,000 lightbulbs burning and have collected the following information.
After 2 months, 98% of the bulbs were still working.
After 8 months, 80% of the bulbs were still working.
We summarize all the data collected below: (Read carefully: the data was not collected at regular intervals.)
Approximate the average lifespan of a lightbulb in months.Round to 2 decimal places.