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Galina-37 [17]
2 years ago
12

2 2/3 +2 2/3 + 2 2/3 +2 2/3

Mathematics
2 answers:
DIA [1.3K]2 years ago
8 0

9514 1404 393

Answer:

  10 2/3

Step-by-step explanation:

Multiplication works nicely on problems involving repeated addition:

  2 2/3 +2 2/3 + 2 2/3 +2 2/3 = 4 × (2 2/3) = 4×2 +4×2/3 = 8 +8/3

  = 8 + 2 2/3 = 10 2/3

MakcuM [25]2 years ago
3 0

Answer:

10.6666666667 is your answer

just round this to the nearest tenth

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Step-by-step explanation:

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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

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3 years ago
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Serjik [45]
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PLEASE HELP QUICK IM OFFERING 10 PTS (Its only worth 2) AND BRAINLIEST ANSWER
Schach [20]

Answer:

Range (Y Values): 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5.

Range= [9,-5] (i think it's in brackets, not for sure)

Domain (X Values): 3, 4, 5, 6, 7.

Domain= [3,7] (check some notes to see if it's supposed to be in brackets or parentheses, it depends, I just can't remember)

Step-by-step explanation:

Domain is the values on the X axis, Range are the values on the Y axis.

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