For a normal population with known variance σ2 , answer the following questions:

(a) What is the confidence level for the interval x n −. σ 2 14 ≤μ≤ + . σ x n 2 14 ?

(b) What is the confidence level for the interval x n −. σ 2 49 x nx n −. σ ≤ 2 49 2 49 μ ≤ +. σ ?

(c) What is the confidence level for the interval x n −. σ 1 85 ≤ μ ≤ +. σ x n 1 85 ?

(d) What is the confidence level for the interval μ ≤ + x 2.00σ n?

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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step-by-step explanatio89

probably the last option

step-by-step explanation: