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garik1379 [7]
3 years ago
15

*starts crying from happiness*❤️❤️❤️❤️❤️❤️❤️❤️❤️

Mathematics
1 answer:
konstantin123 [22]3 years ago
3 0

Step-by-step explanation:

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a road crew must repaved a road that is 2/3 miles long. they can repave 1/12 miles each hour. how long will it take the crew to
anastassius [24]
A long time honestly. 

roughly around 4 hours i would think
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Zina [86]

Answer:

1/24

Step-by-step explanation:

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2 years ago
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every story gets an additional 10% off the already discounted price. if an employee buys an item with an original price of $40,
ANTONII [103]
36.
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5 0
3 years ago
A flashlight battery manufacturer makes a model of battery whose mean shelf life is three years and four months, with a standard
Vladimir [108]

Answer:

17,065 of those batteries can be expected to last between three years and one month and three years and seven months

Step-by-step explanation:

Problems of normally distributed samples can be 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:

I will calculate the time in months. Each year has twelve months.

Mean shelf life is three years and four months, with a standard deviation of three months. So

\mu = 3*12 + 4 = 40

\sigma = 3

Proportion lasting between three years and one month and three years and seven months:

This is the pvalue of Z when X = 3*12 + 7 = 43 subtracted by the pvalue of Z when X = 3*12 + 1 = 37

X = 43

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

Z = \frac{43 - 40}{3}

Z = 1

Z = 1 has a pvalue of 0.8413.

X = 37

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

Z = \frac{37 - 40}{3}

Z = -1

Z = -1 has a pvalue of 0.1587.

0.8413 - 0.1587 = 0.6826

Out of 25,000 batteries:

68.26% of the batteries are expected to last between three years and one month and three years and seven months.

0.6826*25000 = 17,065

17,065 of those batteries can be expected to last between three years and one month and three years and seven months

6 0
3 years ago
I’ll give brainliest!! please help and answer correctly! plsss answer quick
Ghella [55]

Answer:

1st one

hope it helps

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8 0
2 years ago
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