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Quality Control Is an Important Issue at ACME Company Which

question 249

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Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6) .
378, 361, 350, 375, 200, 391, 375, 368, 321

-What is the variance?


Definitions:

Down

a direction towards a lower position or a lower point on a scale.

Quadri-

A prefix meaning "four," used in medical terms to signify four parts or quadruple.

Extra-

A prefix meaning outside, beyond, or in addition to.

Inside

The inner part or space of something.

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