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Jlenok [28]
3 years ago
6

A tourist calculated that if he walks to the railroad station with a speed of 4 mph, he’ll miss the train by half an hour, but i

f he walks with a speed of 5 mph, he’ll reach the station 6 minutes before the departure of the train. What distance does the tourist have to cover?
Mathematics
1 answer:
Levart [38]3 years ago
3 0
He has to cover 6 km in distance, good luck!
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If Myron receives 10 votes from his class of 25 students what percentage does he receive
Vsevolod [243]

Answer:

Myron received 40% votes.

Step-by-step explanation:

Myron receives 10 votes from his class of 25 students and we have to calculate the percentage of the vote received.

Now we will use unitary method to calculate the percentage.

∵ Out of 25 students Myron received votes of = 10 students

∴ Out of 1 student Myron received votes = 10/25 students

∴ Out of 100 students Myron received votes = 10×100/25 = 40%

Myron received 40% votes.  

6 0
3 years ago
Read 2 more answers
Help me pls pls pls
vovangra [49]

Answer:

F, J, K

Step-by-step explanation:

The other choices are regarded as expressions not equations, in which you can find the value of the the given variable.

4 0
2 years ago
Please please please help me I need it within 10 minutes!
Alja [10]
Mr Green- Brown tie
Mr Black- Green tie
Mr. Brown- Black tie

I'm working on 6

Hope this helps in the meantime :)
5 0
3 years ago
According to sleep researchers, if you are between the ages of 12 and 18 years old, you need 9 hours of sleep to be fully functi
Alexxx [7]

Answer:

d) H0:μ=9 and Ha:μ<9

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

p_v =P(t_{(27)}  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

Step-by-step explanation:

Data given and notation  

\bar X=7.9 represent the sample mean

s=2.1 represent the sample standard deviation

n=28 sample size  

\mu_o =9 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 check if the students at this high school are getting too little sleep, the system of hypothesis would be:  

Null hypothesis:\mu \geq 68  

Alternative hypothesis:\mu < 68  

If we analyze the size for the sample is < 30 and we don't know the population deviation so 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".  

The best option for this case would be:

d) H0:μ=9 and Ha:μ<9

Calculate the statistic

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

t=\frac{7.9-9}{\frac{2.1}{\sqrt{28}}}=-2.77    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=28-1=27  

Since is a one sided test the p value would be:  

p_v =P(t_{(27)}  

Conclusion  

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, we can conclude that the true mean is significantly lower than 9 hours at 5% of signficance.  

8 0
3 years ago
simon sold 72 packages of popcorn. there are 9 packages in each box. if he has delivered 27 packages,how many boxes does Simon h
givi [52]
72-27 = 45&#10;\\ 45/9 = 5&#10;\\\boxed {5 \ boxes}
4 0
3 years ago
Read 2 more answers
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