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Inessa [10]
3 years ago
7

Please helpppppp :((

Mathematics
2 answers:
nasty-shy [4]3 years ago
3 0

Answer:

4^{21}

Step-by-step explanation:

kkurt [141]3 years ago
3 0

\frac{4^{12}}{4^{-9}}\\

Given 4 = a

From the properties of exponents for the example...

\frac{a^4}{a^{-2}} = \frac{a*a*a*a}{\frac{1}{a^2} } = (a*a*a*a)*a^2 = a^4 * a^2 = a^{4+2} = a^6

Therefore, the answer is....

4^{12}*4^{9} = 4^{12+9} = 4^{21}

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The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past
galina1969 [7]

Complete Question

The complete question is shown on the uploaded image  

Answer:

1 ) The correct option B

2) The correct option is  C

3)  The correct option is  C

4)  The correct option is  C

Step-by-step explanation:

From the question we are told that

   The proportion that own a cell phone  is  p = 0.90

    The  sample  size is  n =  15

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      X  \ is  \ B( n , p )

So  

       X  \ is  \ B( 15 , 0.90 )

Generally the number students that  own a cell phone in a simple random sample of 15 students is mathematically represented as

              \mu  =  n  *  p

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              \mu  =   13.5

Generally the standard deviation of the number of students who own a cell phone in a simple random sample of 15 students is mathematically represented as

                \sigma  =  \sqrt{ n *  p *  q }

Where  q is mathematically evaluated as

          q =  1- p

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           q =  0.10

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   P(X =  15) =  \left 15} \atop {}} \right.C_{15} *  p^{15} *  q^{15 - 15}    

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7 0
3 years ago
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Snezhnost [94]

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Explanation:

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