A sixteen-sided number cube has the numbers 1 through 16 on each face. Each face is equally likely to show after a roll. What is the probability that you will roll an even number or an odd prime number? Round to the nearest thousandth.
A. 0.063
B. 0.813
C. 0.219
D. 0.875

Question

A sixteen-sided number cube has the numbers 1 through 16 on each face. Each face is equally likely to show after a roll. What is the probability that you will roll an even number or an odd prime number? Round to the nearest thousandth.
  A. 0.063 	
  B. 0.813 	
  C. 0.219 	
  D. 0.875

anonymous · Answer

@ash2326

cwrw238 · Answer

the probability you'l  throw an even number = 0.5 because there are 8 evens and 8 odd numbers.

How many prime numbers are there are there less than 16?
also note that 2 is a prime number.

cwrw238 · Answer

oh  its an odd prime number so thats ok.

cwrw238 · Answer

1,3,5,7,11,13  are your prime numbers

cwrw238 · Answer

so there are 8 even numbers and 6 odd prime numbers .  Total 14

so whats is the probability of getting any one of the 14  out of 16?

cwrw238 · Answer

14/16

grab your calculator  and convert this to a decimal   This will give you the correct option

anonymous · Answer

0.875

anonymous · Answer

0.875

anonymous · Answer

so D

anonymous · Answer

dont i have to round?? @cwrw238

cwrw238 · Answer

right  D

cwrw238 · Answer

its exactly 0.875 so des not need to be rounded

anonymous · Answer

i got it marked wrong :/

anonymous · Answer

ty!