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pickupchik [31]
3 years ago
7

Frank's in-laws have told him they might be visiting for Thanksgiving and Christmas. To prepare, Frank bought his groceries in b

ulk this month. If Frank's in-laws don't come for both Thanksgiving and Christmas, some of his groceries will spoil.
For each holiday, Frank estimates that there is a 70\%70%70, percent chance that his in-laws will visit independent of the other holiday. The table below shows the value of spoiled groceries based on how many holidays Frank's in-laws will visit him.
Mathematics
2 answers:
svlad2 [7]3 years ago
7 0

Answer:

12.90

Step-by-step explanation:

correct on khan academy

Andrei [34K]3 years ago
3 0

Answer:

gnngnn

Step-by-step explanation:

nggnngn

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do no

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Lilit [14]

Answer:

C) 11

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{s}{\sqrt{n}}    

And on this case we have that ME =7 and we are interested in order to find the value of n, if we solve n from the last equation we got:

n=(\frac{z_{\alpha/2} s}{ME})^2  

And replacing the values that we got we have:

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C) 11

8 0
3 years ago
Solve 3x − x + 2 = 12
marissa [1.9K]
<span>3x − x + 2 = 12
2x + 2 = 12
2x = 10
x = 5

answer
x = 5</span>
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3 years ago
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Someone help me with this please.
astra-53 [7]

9514 1404 393

Answer:

  P: $0.12/kWh; M: $0.15/kWh

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Step-by-step explanation:

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The cost per kWh from Company M is the coefficient of x in the equation:

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Company P provides power for a lower cost. The cost from Company P for 2375 kWh is ...

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