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Masteriza [31]
3 years ago
10

Which of the following numbers has the commas in the correct positions

Mathematics
1 answer:
Genrish500 [490]3 years ago
6 0
BBB because it has commas after the right units
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Select the correct answer from each drop-down menu.
o-na [289]

Answer:

The two grades that have a proportional relationship between the numbers of girls and boys are and grade 6 and 8

Step-by-step explanation:

Girls: Boys

9 : 12 (grade 6)

15 : 20 (grade 8)

3 : 4

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3 years ago
It is claimed that automobiles are driven on average more than 20,000 kilometers per year. To test this claim, 100 randomly sele
kow [346]

Answer:

t=\frac{23500-20000}{\frac{3900}{\sqrt{100}}}=8.974      

p_v =P(t_{99}>8.974)=9.43x10^{-15}  

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we to reject the null hypothesis, and the actual mean is significantly higher than 20000.      

Step-by-step explanation:

1) Data given and notation      

\bar X=23500 represent the sample mean  

s=3900 represent the sample standard deviation      

n=100 sample size      

\mu_o =2000 represent the value that we want to test    

\alpha represent the significance level for the hypothesis test.    

t would represent the statistic (variable of interest)      

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.      

We need to conduct a hypothesis in order to determine if the true mean is higher than 20000, the system of hypothesis would be:      

Null hypothesis:\mu \leq 2000      

Alternative hypothesis:\mu > 2000      

We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:      

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)      

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic      

We can replace in formula (1) the info given like this:      

t=\frac{23500-20000}{\frac{3900}{\sqrt{100}}}=8.974      

Calculate the P-value      

First we need to calculate the degrees of freedom given by:  

df=n-1=100-1=99  

Since is a one-side upper test the p value would be:      

p_v =P(t_{99}>8.974)=9.43x10^{-15}  

Conclusion      

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we to reject the null hypothesis, and the actual mean is significantly higher than 20000.      

8 0
3 years ago
During a sale each item in the store is 80% off it's regular price if the regular price of a t-shirt is $18 how much is the disc
7nadin3 [17]

Answer:

so u will pay 3.82 and u will save 15.26 dollars

Step-by-step explanation:

3 0
3 years ago
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Help I don’t no question 1
alukav5142 [94]

Answer:

The answer would be D+ 38.4 cm

Step-by-step explanation:

You would do 1.6 cm times 24

5 0
3 years ago
Help please!! i need to find the value of x
Wewaii [24]
You have to subtract the degrees like in this picture:

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