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gulaghasi [49]
2 years ago
11

If 4 pencils coast $8.00 how much would one coast

Mathematics
2 answers:
Mariulka [41]2 years ago
5 0

Answer:

1 pencil would cost 2 dollars although that is an extremely expensive pencil I reccomend you dont buy it

34kurt2 years ago
4 0

Answer:

Each one costs $2.00

Step-by-step explanation:

$8.00/4 = 2

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Answer:

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Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 1600, \sigma = 70

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile of hours. So it is X when Z has a pvalue of 0.01.

So it is X when Z = -2.33.

Z = \frac{X - \mu}{\sigma}

-2.33 = \frac{X - 1600}{70}

X - 1600 = -2.33*70

X = 1436.9

The bulbs should be replaced each 1436.9 hours.

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3 years ago
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Answer:

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Step-by-step explanation:

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