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zaharov [31]
3 years ago
6

Round 18.79 to the underlined place A. 18 B. 17 C. 20 D. 19

Mathematics
2 answers:
Gnesinka [82]3 years ago
3 0
The answer would be  19. hope that helped
horsena [70]3 years ago
3 0
It's C, 19. How I got it is by look at the first number next to the decimal, if the number is 5 or higher then the number goes up just by one. For an example: 10.45 rounded would just be 10 because the number next to the decimal is lower than 5 but 10.55 rounded would be 11 because the number next to the decimal is 5. I hope this helped!!!
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Use the information given to enter an equation in standard form. Slope is 3, and (2, 7) is on the line.
Lynna [10]

Answer:

3x - y = -1

Step-by-step explanation:

Standard form of equation is Ax + By = C

y - y1 = m (x -x1)

y - 7 = 3 (x - 2)

y - 7 = 3x - 6

3x - y = -7 +6

3x - y = -1

7 0
2 years ago
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Leah ran 6 block north then back 4 block south
Murljashka [212]
Distance of 10 blocks
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3 years ago
If Ashley's GPA is 3.5, about what percentage of students have a GPA lower than Ashley's?
IRINA_888 [86]
Answer: 80%

Explanation:
From the provided graph, read the Relative Cumulative Frequency as 0.8 (or 80%) which corresponds to a GPA of 3.5.
This number represents all GPAs lower than 3.5.

3 0
3 years ago
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A random sample of 21 observations is used to estimate the population mean. The sample mean and the sample standard deviation ar
stepladder [879]

Answer:

a. CI=[128.79,146.41]

b. CI=[122.81,152.39]

c. As the confidence level increases, the interval becomes wider.

Step-by-step explanation:

a. -Given the sample mean is 137.6 and the standard deviation is 20.60.

-The confidence intervals can be constructed using the formula;

\bar X\pm \ z\frac{s}{\sqrt{n}},

where:

  • s is the sample standard deviation
  • z is the s value of the desired confidence interval

we then calculate our confidence interval as:

\bar X\pm z\frac{s}{\sqrt{n}}\\\\=137.60\pm z_{0.05/2}\times\frac{20.60}{\sqrt{21}}\\\\=137.60\pm1.960\times \frac{20.60}{\sqrt{21}}\\\\=137.60\pm8.8108\\\\\\=[128.789,146.411]

Hence, the 95% confidence interval is between 128.79 and 146.41

b. -Given the sample mean is 137.6 and the standard deviation is 20.60.

-The confidence intervals can be constructed using the formula in a above;

\bar X\pm z\frac{s}{\sqrt{n}}\\\\=137.60\pm z_{0.01/2}\times\frac{20.60}{\sqrt{21}}\\\\=137.60\pm3.291\times \frac{20.60}{\sqrt{21}}\\\\=137.60\pm 14.7940\\\\\\=[122.806,152.394]

Hence, the variable's 99% confidence interval is between 122.81 and 152.39

c. -Increasing the confidence has an increasing effect on the margin of error.

-Since, the sample size is particularly small, a wider confidence interval is necessary to increase the margin of error.

-The 99% Confidence interval is the most appropriate to use in such a case.

7 0
4 years ago
It is known that a particular laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older
Alchen [17]

Answer:

 The decision rule is  

Fail to reject the null hypothesis

  The conclusion is

 There is no sufficient evidence to conclude that older people are slower

Step-by-step explanation:

From the question we are told that  

    The average time taken is  \mu =  2.5 \ seconds

      The  sample size is  n =  30

     The sample mean is  \= x =  2.7 \  seconds

      The standard deviation is  \sigma  =  1.4 \  seconds

The null hypothesis is  H_o:  \mu = 2.5

The alternative hypothesis  is  H_a :  \mu >  2.5 \  seconds

Generally the test statistics is mathematically represented as

                z =  \frac{\= x - \mu }{ \frac{\sigma }{ \sqrt{n} } }

=>              z =  \frac{ 2.7  -2.5 }{ \frac{1.4}{ \sqrt{30} } }

=>              z =  0.7825

From the z table  the area under the normal curve to the right corresponding to  0.7825   is  

                p-value  =  P(Z > 0.7825  ) =  0.21696

So from the question we see that the p-value  >  \alpha hence

 The decision rule is  

Fail to reject the null hypothesis

  The conclusion is

 There is no sufficient evidence to conclude that older people are slower

5 0
3 years ago
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