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Yuri [45]
3 years ago
11

The product of six and a number is multiplied by nine

Mathematics
2 answers:
alex41 [277]3 years ago
5 0
6 + y × 9 (the x is a times sign btw)
sdas [7]3 years ago
5 0
I am not sure if this is what you mean but here you go. I hope I helped you. 

b X 6= n *9
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The speeds of vehicles traveling on a highway are normally distributed with an unkown population mean and standard deviation. A
Maksim231197 [3]

Answer:

The 90% confidence interval would be given by (60.09;69.91)    

We are 90% confident that the true mean for the speeds of vehicles traveling on a highway is between 60.09 and 69.91 miles per hour.

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 =65 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=9 represent the sample standard deviation

n=11 represent the sample size  

2) Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=11-1=10

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: "=-T.INV(0.05,10)".And we see that t_{\alpha/2}=1.81

Now we have everything in order to replace into formula (1):

65-1.81\frac{9}{\sqrt{11}}=60.09    

65+1.81\frac{9}{\sqrt{11}}=69.91

So on this case the 90% confidence interval would be given by (60.09;69.91)    

We are 90% confident that the true mean for the speeds of vehicles traveling on a highway is between 60.09 and 69.91 miles per hour.

3 0
3 years ago
Alan's grandfather made 10 pancakes Alan ate 3 pancakes his sister ate 2 pancakes what fraction of the pancakes did Alan eat
Alexandra [31]

Answer:

7/3

Step-by-step explanation:

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3 years ago
Identify the independent and dependent quantities and their units.David rode his bike to the park. After staying at the park for
Nitella [24]

when the time is between 0 and 15 minutes, the distance depends on the time on a relation: d =(1/10)t

when the time is between 15 and 40 minutes, the distance is independent of the time, it is fixed d = 1.5 miles

when the time is between 40 and 50 minutes, the distance depends on the time on the relation: d = 1.5 + (1/10)(t - 40)

3 0
1 year ago
Select the correct answer.
erastovalidia [21]

Answer:

D

Step-by-step explanation:

3+4+5=12

11.8 is most close to 12

PLS GIVE BRAINLIEST

8 0
3 years ago
Read 2 more answers
NEED HELP I CAN'T DO THIS ALONE!!!!! algebra
seraphim [82]


it does not let me install the page i am so sorry I would help you but this thing is to old sorry again  :(



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3 years ago
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