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cluponka [151]
2 years ago
7

I will give brainliest, if it is right, and you are the first person to answer.

Mathematics
2 answers:
madreJ [45]2 years ago
8 0

Answer: 47.25 km

The answer is 47.25 km.

sertanlavr [38]2 years ago
7 0

Answer:47.25

Step-by-step explanation: it is 10.5 x the 4.5

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The number of potholes in any given 1-mile stretch of freeway pavement in Pennsylvania has a Normal distribution. This distribut
Iteru [2.4K]

Answer:

83.85% of 1-mile long roadways with potholes numbering between 22 and 58

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 49

Standard deviation = 9

Using the Empirical Rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 22 and 58?

22 = 49 - 3*9

So 22 is three standard deviations below the mean.

Since the normal distribution is symmetric, 50% of the measures are below the mean and 50% are above the mean.

Of those 50% which are below the mean, 99.7% of those are within 3 standard deviations of the mean, that is, greater than 22.

58 = 49 + 9

So 58 is one standard deviation of the mean.

Of those which are above the mean, 68% are within 1 standard deviation of the mean, that is, lesser than 58.

Then

0.997*0.5 + 0.68*0.5 = 0.8385 = 83.85%

83.85% of 1-mile long roadways with potholes numbering between 22 and 58

5 0
2 years ago
If a stadium has 50,000 seats, how many concert tickets would have to be sold for the event to be 85% sold out?
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Answer:

42500

Step-by-step explanation:

50000x0.85=42500

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In 2014, adele sold 2,500,000 records. In 2015, she sold 90% of the number of records she sold in 2014. In 2016, she sold 80% of
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She sold 70% bc 100% - 90% - 80% -70%
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Step-by-step explanation:

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