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Cerrena [4.2K]
4 years ago
3

The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of

2.98 minutes in length with a standard deviation of 0.98 minute. At α=0.05, can it be concluded that the average differs from the population average?
Mathematics
1 answer:
borishaifa [10]4 years ago
5 0

Answer:

Step-by-step explanation:

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Jeff has 1/2 pizza left in the fridge. At breakfast he at 1/3 of it. What fraction of the original pizza does he have left for l
fenix001 [56]
If Jeff starts with 1/2 of a pizza then eats 1/3 of it he has 2/3 of 1/2 left. Therefore if you multiply those together you get your answer.

(2/3)*(1/2)=2/6=1/3
Jeff has 1/3 of the pizza left
4 0
3 years ago
A zoo train ride costs $4 per adult and $1 per child. On a certain day, the total number of adults (a) and children (c) who took
lilavasa [31]
Its all about process of elimination. Answer C
4 0
3 years ago
One solution, infinitely many solutions, or no solution for #13?
Lady_Fox [76]

Answer:

For this system of equations there is infinitely many solutions.  

Step-by-step explanation:

Given the equations:  -4x + 4y = 32 and 3x + 24 = 3y, we need to first get them both in standard form (Ax + By = C) in order to complete the method of elimination to solve.  The first equatoin is already in standard form, however, in order to convert the second equation, we will need to use inverse operations to move the '3x' to the other side of the equation by subtraction of this term from both sides:  3x - 3x + 24 = 3y - 3x or 24 = -3x + 3y.  Rearranging the equation gives us:  -3x + 3y = 24.  In order to use elimination to solve, we must first multiply the first equation be a factor of 3 and the second equation by a factor of -4 in order to have opposite coefficients:

3[ -4x + 4y = 32] = -12x + 12y = 96

-4{-3x + 3y = 24] = 12x - 12y = -96

You can see that if we add these too equations together, we get 0 = 0, which indicates that they are both the same line, making our answer infinitely many solutions.  

8 0
3 years ago
Read 2 more answers
Using the chart on page 651 for the simulation of customers going to the checkout counters, how many customers would be represen
Lera25 [3.4K]

Answer:

2

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Please help me. I really don't know dis​
stiks02 [169]

Answer:

I would do C because 2/3 is close to a whole so then you would get -3 and 1/4  is close to 0 so just keep 18 the same which would be -18 so -18 divided by -3 would be correct

Step-by-step explanation:

5 0
3 years ago
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