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FromTheMoon [43]
3 years ago
12

Helpppppppppppppppplz

Mathematics
2 answers:
slamgirl [31]3 years ago
7 0
370 m mark because the runner is only 2 meters away from that one instead of the 360 meter mark which is 8 meters away
Snowcat [4.5K]3 years ago
7 0

When rounding, if the digit in the one's place is higher than 5, you round up. If it's lower than 5, you round down.

<h3>Answer and explanation:</h3>

She's closer to 370m. Since the runner is at 368m and the digit in the ones place is higher than 5, you have to round up to 370. This means the runner is closer to 370m.

<em>Hope this helps!</em>

~ V

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A researcher examines 27 water samples for iron concentration. The mean iron concentration for the sample data is 0.802 cc/cubic
Delvig [45]

Answer:

90% confidence interval for the population mean iron concentration is [0.771 , 0.832].

Step-by-step explanation:

We are given that a researcher examines 27 water samples for iron concentration. The mean iron concentration for the sample data is 0.802 cc/cubic meter with a standard deviation of 0.093.

Firstly, the pivotal quantity for 90% confidence interval for the population mean iron concentration is given by;

         P.Q. = \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, \bar X = sample mean iron concentration = 0.802 cc/cubic meter

             s = sample standard deviation = 0.093

             n = number of water samples = 27

             \mu = population mean

<em>Here for constructing 90% confidence interval we have used t statistics because we don't know about population standard deviation.</em>

So, 90% confidence interval for the population mean, \mu is ;

P(-1.706 < t_2_6 < 1.706) = 0.90  {As the critical value of t at 26 degree of

                                                 freedom are -1.706 & 1.706 with P = 5%}

P(-1.706 < \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } < 1.706) = 0.90

P( -1.706 \times {\frac{s}{\sqrt{n} } } < {\bar X - \mu} < 1.706 \times {\frac{s}{\sqrt{n} } } ) = 0.90

P( \bar X -1.706 \times {\frac{s}{\sqrt{n} } < \mu < \bar X +1.706 \times {\frac{s}{\sqrt{n} } ) = 0.90

<u>90% confidence interval for</u> \mu = [ \bar X -1.706 \times {\frac{s}{\sqrt{n} } , \bar X +1.706 \times {\frac{s}{\sqrt{n} } ]

                                                 = [ 0.802 -1.706 \times {\frac{0.093}{\sqrt{27} } , 0.802 +1.706 \times {\frac{0.093}{\sqrt{27} } ]

                                                 = [0.771 , 0.832]

Therefore, 90% confidence interval for the population mean iron concentration is [0.771 , 0.832].

4 0
3 years ago
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Answer:

B

Step-by-step explanation:

In the attached file

8 0
3 years ago
Brainliest for right answer!!!
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Let y=x+6 be equation 1...
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Write the equation of the line graphed below.
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Catherine owns $22.50 on her lunch account balance. She pays $15 toward her balance. What is the status of her account balance n
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Answer:

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