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MakcuM [25]
3 years ago
9

9 out of 20 students ride the bus to school. Find the percent.

Mathematics
2 answers:
kondaur [170]3 years ago
6 0

Answer:45%

Step-by-step explanation:

shtirl [24]3 years ago
3 0

Answer:

45%

Step-by-step explanation:

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For a which one the lifeguard or snack hut at the pool which one would take longer to save money
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A standard weight known to weigh 10 grams. Some suspect bias in weights due to manufacturing process. To assess the accuracy of
notsponge [240]

Answer:

a) The 98% confidence interval for the mean weight is between 10.00409 grams and 10.00471 grams

b) 49 measurements are needed.

Step-by-step explanation:

Question a:

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 - 0.98}{2} = 0.01

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 - 0.01 = 0.99, so Z = 2.327.

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 = 2.327\frac{0.0003}{\sqrt{5}} = 0.00031

The lower end of the interval is the sample mean subtracted by M. So it is 10.0044 - 0.00031 = 10.00409 grams

The upper end of the interval is the sample mean added to M. So it is 10 + 0.00031 = 10.00471 grams

The 98% confidence interval for the mean weight is between 10.00409 grams and 10.00471 grams.

(b) How many measurements must be averaged to get a margin of error of +/- 0.0001 with 98% confidence?

We have to find n for which M = 0.0001. So

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

0.0001 = 2.327\frac{0.0003}{\sqrt{n}}

0.0001\sqrt{n} = 2.327*0.0003

\sqrt{n} = \frac{2.327*0.0003}{0.0001}

(\sqrt{n})^2 = (\frac{2.327*0.0003}{0.0001})^2

n = 48.73

Rounding up

49 measurements are needed.

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3 years ago
Which is the following statements is NOT true?
Dominik [7]

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The last one is the answer; The slope of AB is different than the slope of BC.

Step-by-step explanation:

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Find the coordinates of the midpoint of the segment with the given pair of endpoints. J(6, 6); K(2, –4)
Levart [38]

Answer:

(4,1)

Step-by-step explanation:

let J(6,6) be x1, y1

let K(2,-4) be x2, y2

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=(6+2)/2 ,(6-4)/2

= 8/2 ,2/2

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What is the equation of the following graph?
nignag [31]

Answer:

{y}^{2}  = 24x

Step-by-step explanation:

This is horizontal parabola.

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The focus is (6,0)

The equation of this parabola is of the form

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Where (p,0) is the focus

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This implies that

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