+0  
 
0
128
2
avatar+4690 

Help 31,32

 May 15, 2018
 #1
avatar+94619 
+1

31.

 

Area  of the  board  =  pi * 16^2  = 256 pi

Area  of the bulls-eye  = pi *  6^2  =  36 pi

 

So....the probability  is     36  / 256  =   9/64  ≈  14.1%

 

 

32.

 

P ( prime  or > 4)   =  P(prime) + P (> 4)  - P (prime and  > 4)  =

 

                                   3/6           +  2/6    -  1/6   =

 

                                              4/6  =

 

                                              2/3

 

 

 

cool cool cool

 May 15, 2018
 #2
avatar+3763 
+2

32.

 numbers greater than 4, or prime numbers.

 

2,3,5,6

4/6

=2/3

smileysmiley

 May 15, 2018

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