Casey has 5/6 left of a section of sidewalk to clean. If he can clean 5/18 of a section in 1 minute, how long will it take him t
1 answer:
Answer:
Casey will take 3 minutes to clean part of the section.
Step-by-step explanation:
∵ Casey takes the time to cleans of a section = 1 minute
∴ He will take the time to clean complete section =
=
= 3.6 minutes
Now time taken to clean part of the section =
= 3 minutes
Therefore, left part of the section will be cleaned by Casey in 3 minutes.
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Firstly, factor out 3x on the right side of the equation:
Next, use the zero product property to solve y = 0:
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If ages are normally distributed then using a significance level of 0.05 , we can claim that the population mean is greater than 24.
Given sample mean of 25 years , sample size of 16 ,standard deviation of 2 years.
We have to find whether the population average is greater than 24.
We have to use t test because n is less than 30. It is right tailed.
We have to first form Hypothesis.
:μ>24,
:μ<24.
t=X-μ/S/
t critical at 5% significance level and degree of freedom=15 (16-1)=1.7531
t=24-25/2/
=-1/0.5
=-2
Because 1.7531 is greater than -2 so we will accept the null hypothesis.
Hence we can say that the average of population is greater than 24.
Learn more about t test at brainly.com/question/6589776
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