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katovenus [111]
2 years ago
6

PLEASE ANSWER

Mathematics
1 answer:
Nina [5.8K]2 years ago
3 0

Answer:

there are 3 Juniors, 4 sophomores and 8 seniors

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coefficient of what?

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5.25 divided by 3<br> Thank You.
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Many people feel that the drying of pavement marking paint is much too slow. You spend several days looking for the fastest dryi
slavikrds [6]

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21

Step-by-step explanation:

Using<em> Simple Random Sampling</em>, we can estimate the sample size by the formula

\bf n=\frac{Z^2S^2}{e^2}

where  

n = sample size

Z = the z-score corresponding to the confidence level 99.5%

S = the assumed standard deviation = 3 seconds

e = margin of error = 2 seconds

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The z-score corresponding to a confidence level of 99.5% can be obtained either with a table or the computer and equals

Z = 3.023

Replacing the values in our formula

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So the size of the sample should be at least 21.

7 0
3 years ago
Expand or simplify <br>3c(5+c) -2(3c-7)​
Luden [163]
3c(5+c) -2(3c-7)
15c+3c^2-6c+14
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What is the gradient?
notsponge [240]

Answer:

Gradient = 2

Step-by-step explanation:

Gradient of a line = Slope of the line

Since, slope of a line passing through two points (x_1, y_1) and (x_2,y_2) is given by,

Slope = \frac{y_2-y_1}{x_2-x_1}

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Therefore, slope or gradient of the line = \frac{2-0}{2-1}

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Gradient = 2 will be the answer.

7 0
3 years ago
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