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Neporo4naja [7]
3 years ago
13

UGRENT!!!!! PLEASE HELP!!!!!!!

Mathematics
1 answer:
Charra [1.4K]3 years ago
7 0

Answer:

4

Step-by-step explanation:

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22.5/3.5=6.4285 . You can round if needed


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3 years ago
The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to ar
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Answer:

C) 11

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

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s represent the sample standard deviation

n represent the sample size  

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{s}{\sqrt{n}}    

And on this case we have that ME =7 and we are interested in order to find the value of n, if we solve n from the last equation we got:

n=(\frac{z_{\alpha/2} s}{ME})^2  

And replacing the values that we got we have:

n=(\frac{1.64(14)}{7})^2 =10.758 \approx 11

C) 11

8 0
3 years ago
CAN SOMEONE MAKE SENSE OUT OF THIS. please i need explaining!!! Shawn's square living room needs new flooring. He needs 196 squa
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Step-by-step explanation:

Shawn's living room is a square, so all four sides are the same length.  Area of a square is A = s², and we know the area is 196 ft².  If substitute this for A:

196 ft² = s²

Take square root of both sides:

s = √(196 ft²)

s = ±14 ft

Since measurements of lengths can't be negative, s must be +14 ft.  So Shawn's living room is 14 ft x 14 ft.

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Step-by-step explanation: Hope this helped.

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Which of the following functions is graphed below?
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A and b because they all are negative
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