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Help 6,7

NotSoSmart  Apr 16, 2018
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6.  Less than 2  = 1/10

    Greater than 7  = 3/10

So  1/10 + 3/10  =  4/10   =  2/5

 

 

7.   Area A  = pi (4)^2  =  16pi

      Area B  =  Area B  - Area A  =  pi (4 + 4)^2 - pi (4)^2    =     48 pi     

       Area C  =  pi (4 + 4 + 4)^2  - pi (4 + 4)^2   =    144pi  - 64pi   = 80pi   (3)

      Area D  =  pi (4 + 4 + 4 + 4)^2 - Pi(4 + 4 + 4)^2  =  256pi  - 144pi  =  112pi

 

Prob B  =     Area B  / sum of the areas  =  48pi  /  ( [ 16 + 48 + 80 + 112] pi  )  =

 

                      48  / 256  =

 

                       3 / 16

 

 

cool cool cool     

                

 

      

CPhill  Apr 16, 2018

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