{Battery Life Narrative} What lifetime should the manufacturer advertise for these batteries in order that only 2% of the lamps will wear out before the advertised lifetime?

Normal Distribution

A probability distribution that is symmetrical around its mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Advertised Lifetime

Advertised Lifetime typically refers to the expected duration or lifespan of a product as claimed by its manufacturer or seller.