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serious [3.7K]
3 years ago
9

K over 2 -10 = 25 solve for k

Mathematics
2 answers:
kari74 [83]3 years ago
8 0
\frac{k}{2}- 10 = 25 \\  \frac{k}{2}  + (-10) = 25 \\ \\ Add10:  \frac{1}{2}k - 10 + 10 \\ = 25 + 10 \\ 25 + 10 = 35,right? \\   \frac{1}{2}k = 35 \\ \\ Multiply2: 2( \frac{1}{2}k) (Cancel) \\ = 2(35)  (Keep) \\ 2(35)= 70, right? \\ \\ \\ \\ Answer: K = 70

good luck on your assignment and  enjoy your day! 

~MeIsKaitlyn:)
pshichka [43]3 years ago
6 0
(k/2)-10= 25

Add 10 to both sides
k/2=35

Multiply both sides by 2
k=70

Final answer: k=70
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Step-by-step explanation:

Information provided

\bar X=7.4 represent the sample mean

s=0.7 represent the sample standard deviation

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\mu_o 7 represent the value to verify

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System of hypothesis

We want to verify if the average amount of coffee per cup is different from 7 ounces, the system of hypothesis would be:  

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Alternative hypothesis:\mu \neq 7  

The statistic is given by:

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

Replacing the info given we got:

t=\frac{7.4-7}{\frac{0.7}{\sqrt{7}}}=1.512    

The degrees of freedom are

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