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sladkih [1.3K]
3 years ago
12

Sue bought ten items at an average price of $3.60. The cost of eight of the items totaled $30. If the other two items were the s

ame price, what was the price she paid for each ?
1) $15, 2) $7.50, 3) $6, 4) $3, 5) $1.50

I guess the answer is $7.50.
What is yr answer ???
Mathematics
2 answers:
Katen [24]3 years ago
7 0
Ok soo if the 10 items avg $3.60 each then your total for the ten items was $36. if we know that the cost of 8 items is $30 then there is 6 dollars left. nd if we no that the remaining 2 are the same price then each should be $3  
Nina [5.8K]3 years ago
6 0
\frac{30+2x}{10}=3.60\ \ \ \ /\cdot10\\\\30+2x=36\ \ \ \ /-30\\\\2x=6\ \ \ /:2\\\\x=3\ (\$)

Answer:\$3\ (4)
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z=\frac{31.1-31.3}{\frac{1.3}{\sqrt{140}}}=-1.82  

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Information given

\bar X=31.1 represent the sample mean  

\sigma=1.3 represent the population standard deviation

n=140 sample size  

\mu_o =31.3 represent the value that we want to test  

\alpha=0.02 represent the significance level for the hypothesis test.  

z would represent the statistic

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We want to test if the true mean is equal to 31.3 MPG, the system of hypothesis would be:  

Null hypothesis:\mu =31.3  

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Since we know the population deviation, the statistic is given by

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

Replacing we got:

z=\frac{31.1-31.3}{\frac{1.3}{\sqrt{140}}}=-1.82  

The p value for this case would be given by:

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