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sertanlavr [38]
3 years ago
15

Suppose that a customer service center claims that the telephone calls it recieves last 113 seconds on average, with a standard

deviation of 9 seconds. if you took a sample of 324 phone calls, which of the following mean times would be within the 95% confidence interval?
A. 116.5 seconds
B. 114.5 seconds
C. 113.5 seconds
D. 115.5 seconds
Mathematics
2 answers:
zimovet [89]3 years ago
8 0

Answer: 113.5 sec

Step-by-step explanation:

Apex 2019

atroni [7]3 years ago
3 0

Answer:

113.5 seconds

Step-by-step explanation:

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A waitress sold 10 ribeye steak dinners and 18 grilled salmon dinners, totaling $590.39 on a particular day. anither day she sol
Len [333]

Answer:

   a) The cost of ribeye steak dinners is $ 16.96.

   b) The cost of grilled salmon dinners is $ 23.37.

Explanation:

 Let the cost for ribeye steak dinners  be m and cost for grilled salmon dinners  be n.

 A waitress sold 10 ribeye steak dinners and 18 grilled salmon dinners, totaling $590.39 on a particular day.

So, we have    

         10 m + 18 n = 590.39 -------equation 1

Another day she sold 22 ribeye steak dinners and 9 grilled salmon dinners, totaling $583.49

So, we have    

         22 m + 9 n = 583.49 -------equation 2

 equation 2 x 2

       44 m + 18 n = 1166.98 -------equation 3

 equation 3 - equation 1

        44 m + 18 n - (  10 m + 18 n ) = 1166.98 - 590.39

         m = 16.96 $

  Substituting in equation 1

        22 x 16.96 + 9 n = 583.49

          n = 23.37 $

   a) The cost of ribeye steak dinners is $ 16.96.

   b) The cost of grilled salmon dinners is $ 23.37.

6 0
3 years ago
Which statement about solving inequalities is true?
PIT_PIT [208]

None of the statements on that list is true.

8 0
3 years ago
Read 2 more answers
Write a ratio for 2 batches of this recipe.
DENIUS [597]
1/2 1/2 of what recipe tho??
4 0
3 years ago
Please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Vedmedyk [2.9K]

Answer:

30

Step-by-step explanation:

  1. How much was the decrease from Figure A to Figure B (let x be the decrease): 45x = 27
  2. Divide each by 45 to cancel out the 45 next to x. It should now look like this: x = 3/5
  3. To find x, we would normally multiply x by 3/5, but because we don't have x, we just DIVIDE 18 by 3/5: 18 ÷ 3/5 = 30
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I hope this helps!

7 0
3 years ago
If the simple interest on $7,000 for 9 years is 3,780, then what is the interest rate?
Andreas93 [3]

Answer:

6%

Step-by-step explanation:

Interest = Principal × Rate × Time/100

$3780 = $7000(9)(rate)/100

63000rate = 378000

rate= 378000/63000

rate = 6% per annum (Answer)

8 0
3 years ago
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