Battery Life a Certain Brand of Batteries Has a Lifetime That

question 188

Short Answer

Battery Life
A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. ​ ​
-{Battery Life Narrative} What proportion of these batteries will last for more than 4,000 hours?

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Definitions:

Cementation

The precipitation of a binding material (the cement) around grains in sedimentary rocks.

Rock Types

Rock types are classifications of rocks based on their genesis, including three main categories: igneous, sedimentary, and metamorphic.

Conglomerate

A coarse-grained sedimentary rock composed of rounded fragments larger than 2 mm in diameter, embedded in a matrix of finer particles and cemented together.

Breccia

Breccia is a coarse-grained sedimentary rock composed of angular fragments of minerals or rocks cemented together, often formed in fault zones or as volcanic ejecta.