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WITCHER [35]
4 years ago
11

Harshini rode her bicycle 13.76 kilometers on Monday, 9.8 kilometers on Wednesday, and 16.415 kilometers on Friday. She used the

addition below to determine the total distance she rode over the three days. 13.76 + 9.8 + 16.415 = 39.975. All decimal points are aligned. Which method determines whether her answer is reasonable?
A.) Remove the decimal points and add 137 + 98 + 16415 = 17,889; since 17,889 is not close to 39.975, her answer is not reasonable.

B.) Round all the numbers to 20; since 20 + 20 + 20 = 60 and 60 is not close to 39.975, her answer is not reasonable.

C.) Round all the numbers to 10; since 10 + 10 + 10 = 30 and 30 is close to 39.975, her answer is reasonable.

D.) Round 13.76 to 14, round 9.8 to 10, and round 16.415 to 16; since 14 + 10 + 16 = 40 and 40 is close to 39.975, her answer is reasonable.
Mathematics
1 answer:
Zielflug [23.3K]4 years ago
7 0

Answer: AKA B

Step-by-step explanation:

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y = kx

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3 years ago
The average wall thickness of 25 panes of glass is 4.05 mm. The standard deviation of the thickness of the 25 panes is measured
mina [271]

Answer:

u => 4,028

Step-by-step explanation:

To find the answer, we have the following formula:

u => m - t (alpha, n-1) * [sd / (n) ^ (1/2)]

where m is the mean.

where sd is the standard deviation.

where n is the sample size.

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Therefore, alpha = 1 - 0.9 = 0.1.

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So it would come being t (0.1, 24), if we look in the table, which I will attach the value of t is equal to 1.318.

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Which means that the interval with a 90% confidence of the wall thickness measurement is:

u => 4.028

6 0
4 years ago
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