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AnnyKZ [126]
4 years ago
8

A study of long-distance phone calls made from General Electric Corporate Headquarters in Fairfield, Connecticut, revealed the l

ength of the calls, in minutes, follows the normal probability distribution. The mean length of time per call was 3.5 minutes and the standard deviation was 0.70 minutes. What is the probability that calls last between 3.5 and 4.0 minutes? (Round your z value to 2 decimal places and final answer to 4 decimal places.)
Mathematics
1 answer:
iren [92.7K]4 years ago
3 0

Answer:

0.2611

Step-by-step explanation:

Given the following information :

Normal distribution:

Mean (m) length of time per call = 3.5 minutes

Standard deviation (sd) = 0.7 minutes

Probability that length of calls last between 3.5 and 4.0 minutes :

P(3.5 < x < 4):

Find z- score of 3.5:

z = (x - m) / sd

x = 3.5

z = (3.5 - 3.5) / 0.7 = 0

x = 4

z = (4.0 - 3.5) / 0.7 = 0.5 / 0.7 = 0.71

P(3.5 < x < 4) = P( 0 < z < 0.714)

From the z - distribution table :

0 = 0.500

0.71 = very close to 0.7611

(0.7611 - 0.5000) = 0.2611

P(3.5 < x < 4) = P( 0 < z < 0.714) = 0.2611

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Answer:

Net income: $4,260.

Step-by-step explanation:

We have been given that consider the overall effects on Floral Scent Cleaning Service from selling and performing services on account for $ 8,780 and paying expenses totaling $ 4,520.

\text{Net income}=\text{Total revenues}-\text{Total expenses}

\text{Net income}=\$8,780-\$4,520

\text{Net income}=\$4,260

Since the selling and performing services on account are greater than total expenses, therefore, Floral Scent Cleaning​ Service's net income is $4,260.

7 0
4 years ago
What's 27/40 as a decimal​
Klio2033 [76]

Answer:

0.675

Step-by-step explanation:

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7 0
3 years ago
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For all real numbers b and c such that the product of
qwelly [4]

Answer:

E: b/3+3

Step by step:

3 C= b

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Answer: E: b/3 + 3

Hope this helps

3 0
4 years ago
Mo’s farm stand sold a total of 165 pounds of apples and peaches. She sold apples for $1.75 per pound and peaches for $2.50 per
9966 [12]

Answer: 65 pounds of Peaches were sold.

Step-by-step explanation:

Let the number of pounds of  Peaches sold                  = X pounds

Therefore the pound of apple sold                                 = (165 - X ) pounds

Total pounds of apple and peaches sold                       = 165 pounds

Sale made on Peaches at the cost of $2,50 per Peache = $2.50X

sale made on apple sold at the cost of $1.75 per apple  = $1.75(165 - x )

Total sale made on the sale of both Peaches and apple = $337.50

Therefore , open the bracket, add everything together and equate to the total sale made which is $337.50

 we now have

  2.50x + 1.75( 165 - x ) = 337.50

  2.50x + 1.75 x 165 - 1.75x = 337.50

  2.50x + 288.75 - 1.75x = 337.50

collect like terms

2.50x - 1.75x = 337.50 - 288.75

           0.75x = 48.75

divide through by the coefficient of x which is 0.75

                   x = 48.75/0.75

                      = 65pounds .

Therefore, Mo's farm sold 65 pounds of Peaches.

Check ;

  65 x 2.50 = $162.5

   subtract 65 from 165 to get the pound of the appel

   165 - 65 = 100 pounds of apple was sold.

 now multiply 100 x 1.75

                  = $175

Now add the two together to give the total sale ,

                $162.5 + $175  = $337.50.

 

                           

4 0
3 years ago
Please help me!!!!!!!​
iris [78.8K]

Answer:

7 lenth

Step-by-step explanation:

4 0
3 years ago
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