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John has a spinner with eight equal sectors with labels from 1 to 8. He spins the spinner once.

What is the probability that he gets a number less than 4 or a multiple of 4?

 

Answer choices:

  • 1/2
  • 3/32
  • 5/8
  • 3/4
 Feb 4, 2018
 #3
avatar+101369 
+1

P  ( <4  or multiple of 4 )   =

 

P( < 4)   +   P (multiple of 4 )   -  P(<4  and multiple of 4)   =

 

(3/8)      +   ( 2/8)    -      0  =

 

5 / 8

 

Note  that  P( < 4  and multiple of 4)  = 0  because there are no multiples of 4 that are < 4

 

 

cool cool cool

 Feb 5, 2018

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