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kupik [55]
3 years ago
9

Chris wants to triple 63.374. He says it must end in 9. Is he correct? Explain your answer.

Mathematics
1 answer:
alukav5142 [94]3 years ago
4 0
He is wrong.  we are only looking at the last number which is 4
if we tripple 4 or 4*3 we get 12 which ends in 2, not 9

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If you double 4 and if you double 1/2 then add 1, add 8 +1
Anna35 [415]

Answer:

19?

Step-by-step explanation:

double of 4 is 8, double of 1/2 is 1 and adding them all together is 19

6 0
3 years ago
What is 999 times 100.0​
11Alexandr11 [23.1K]

Answer:

99,900

Step-by-step explanation:

3 0
3 years ago
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Felicity the unicorn is in the forest. She is enjoying a delicious melon. A weasel grabs the melon out of her mouth and starts t
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6

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bc i know

8 0
3 years ago
jenna is running a trail that is 8 and 4/7 miles long. if she finished 5/9 of the distance about how far has she run?
Julli [10]
Trail is 8 and 4/7
she ran 4/7 of it


convert 8 and 4/7 to improper for ease
8 and 4/7=8+4/7=56/7+4/7=60/7
4/7 of 60/7=
4/7 times 60/7=
240/49=
196/49+44/49=
4 and 44/49

she ran 4 and 44/49 miles



3 0
3 years ago
A random sample of 20 shoppers was taken. Sample data showed that they spend an average of $24.50 per visit at the Sunday Mornin
slava [35]

Answer:

a) The point estimate of the population mean is \hat \mu = \bar X =24.50

b) The 90% confidence interval would be given by (23.339;25.661)    

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=24.50 represent the sample mean

\mu population mean (variable of interest)

s=3.00 represent the sample standard deviation

n=20 represent the sample size  

2) Part a

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

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

The point estimate of the population mean is \hat \mu = \bar X =24.50

3) Part b

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

df=n-1=20-1=19

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(0.05,19)".And we see that t_{\alpha/2}=1.73

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

24.5-1.73\frac{3}{\sqrt{20}}=23.339    

24.5+1.73\frac{3}{\sqrt{20}}=25.661

So on this case the 90% confidence interval would be given by (23.339;25.661)    

6 0
3 years ago
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