the table shows the test scores and the sleep averages of several students.
test score (%) 88,75,76,92,96,94,83,90,99,65,77,88 ,82,83,94,97
average sleep (h) 7,6.5,6,7.5,8,7,6.5,8,8.5 5,7,9,8,8.5,8.5,9
(a)write the least squares regression equation that models the data. let x = the test score and y = average sleep.
(b)use the equation to determine the approximate test score of a student who sleeps an average of 8 h a night. i understand if you don't want to give me the answer but can you at least explain what i have to do.

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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