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2 years ago

A battery manufacturer randomly tests 500 batteries and finds that 3 are defective.

Mathematics

2 answers:

Alexxx [7]2 years ago

8 0

(3/500)*(12,000) = 72 batteries . . . answer is B) 72

Gala2k [10]2 years ago

7 0

If you set up the problem and put 500 / 3 = 12,000 / x, you could cross multiply. 12,000 times 3 = 500 times x.
36,000 = 500x Now divide both sides by 500.
72 = x
The answer is B.72!

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Olin [163]

Answer:

$P(16.5$

And using the normal standard table or excel we find the probability:

$P(-1.768< Z< 1.768) = P(Z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the avergae number of weeks an individual is unemployed of a population, and for this case we know the distribution for X is given by:

$X \sim N(17.5,4)$