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zaharov [31]
3 years ago
7

Devin measured his basketball rim. The radius of the rim is 6 inches. What is the circumference of the rim?

Mathematics
1 answer:
sergiy2304 [10]3 years ago
8 0
The circumstance of the rim is 37.6
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A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

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 = 1200, \sigma = 60

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

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

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

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

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2 years ago
HELP ASAP! A tree is currently 8 feet tall and grows 3 feet per year.
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3 years ago
Yoko buys candy that costs $8 per pound. She will spend $40 on candy. What are the possible numbers of pounds she will buy?
sergiy2304 [10]

Answer:

5pd

Step-by-step explanation:

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2 years ago
Help PLEASE THE LINK IS DOWN BELOW I TIMES
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The answer is A because its simple reading. Are you 4? Because this is easy smh
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The profits for selling T-shirts at the school store is $40 for every 10 shirts. Write an equation and graph the relationship ​
Deffense [45]

Answer:

 i think this is what your looking for

Step-by-step explanation:

the relationship is that they always go up by 40

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