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Ksivusya [100]
3 years ago
9

Bella is looking into getting an apartment that costs $800 per month. how much does she need to make per year in order to comfor

tably afford this much in rent?
Mathematics
2 answers:
irina1246 [14]3 years ago
8 0

Answer: $41,600

Step-by-step explanation:

marishachu [46]3 years ago
3 0
    If an apartment costs $800 per month and Bella wants to stay one year, she needs to pay:
    12  x $800 = $9.600 
    Answer:  She needs to make more than $9,600.
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Step-by-step explanation:

We are given that a nationwide census is conducted and it is found that the mean number of hours of television watched per year by Americans is 350 with a standard deviation of 220.

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Let \bar X = <u><em>sample mean number of hours of television watched per year</em></u>

The z score probability distribution for sample mean  is given by;

                             Z  =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \mu = population mean = 350

            \sigma = standard deviation = 220

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Now, the probability that a group of 4 Americans watch more than 400 hours of television per year is given by = P(\bar X > 400 hours)

     

     P(\bar X > 400) = P( \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } } > \frac{400-350}{\frac{220}{\sqrt{4} } } ) = P(Z > 0.45) = 1 - P(Z \leq 0.45)

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The above probability is calculated by looking at the value of x = 0.45 in the z table which has an area of 0.6736.

Hence, the probability that a group of 4 Americans watch more than 400 hours of television per year is 0.3264.

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