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navik [9.2K]
3 years ago
10

Two stores sell CDs in packages, as shown in the table below.

Mathematics
2 answers:
Bogdan [553]3 years ago
7 0

Answer:

The cost at Store A is $2.00 greater than at Store B. (Option A)

blagie [28]3 years ago
4 0

Answer:

is B

Step-by-step explanation:

because the cost at store B is $2.00 greater that at store A

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What is a number less than 130 that rounds to 130 when rounding to the nearest ten
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Answer:

129.99

Step-by-step explanation:

129.99 rounds to 130 because the 9 in the hundredths place causes the 9 in the tenths place to round up, making the number 130.0.

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Phonics is an instructional method in which children are taught to connect sounds with letters or groups of letters. A sample of
Fantom [35]

Answer:

A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.05 = 0.95, so Z = 1.645.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.645\frac{23.44}{\sqrt{141}}

M = 3.25

The lower end of the interval is the sample mean subtracted by M. So it is 34.09 - 3.25 = 30.84.

The upper end of the interval is the sample mean added to M. So it is 34.09 + 3.25 = 37.34.

A 90% confidence interval for the mean number of letter sounds identified in one minute is: (30.84, 37.34).

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3 years ago
What is the time the past from start to end
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First time = 7:12
second time = 7:40
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28 minutes have past
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