Pulsified333
  • Pulsified333
Two fair die are rolled. What is the probability of one of the dice showing 5 or the sum being at least 8?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Pulsified333
  • Pulsified333
well I know the sum of 8's probability is 5/36
Pulsified333
  • Pulsified333
right so wouldn't it be 1/6?
anonymous
  • anonymous
+ the probability of at least 8

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Pulsified333
  • Pulsified333
so would it be 6/36?
Pulsified333
  • Pulsified333
you mean 2/36?
Pulsified333
  • Pulsified333
so the answer would be 7/36?
anonymous
  • anonymous
sorry can you forget about what I just said?
Pulsified333
  • Pulsified333
yeah
Pulsified333
  • Pulsified333
why?
anonymous
  • anonymous
for at least one to be a 5 would be 11/36
anonymous
  • anonymous
(for each dice)( 1/6 + 1/6) - 1/36 (because there's a double) = 11/36
Pulsified333
  • Pulsified333
so the answer is 11/36?
anonymous
  • anonymous
+ at least 8
Pulsified333
  • Pulsified333
so 11/36+16/36
anonymous
  • anonymous
- the mutual part
Pulsified333
  • Pulsified333
-1?
Pulsified333
  • Pulsified333
13/18?
anonymous
  • anonymous
-6/36
anonymous
  • anonymous
21/36
Pulsified333
  • Pulsified333
why -6/36
anonymous
  • anonymous
because (5,1)(5,2)(5,3)(3,5)(2,5)(1,5) are included in both probabilities.
Pulsified333
  • Pulsified333
oh let me check
anonymous
  • anonymous
I hope that's right.
Pulsified333
  • Pulsified333
would it be 7/12? simplified
anonymous
  • anonymous
yes
Pulsified333
  • Pulsified333
I did it backwards the sum of being at least 8 would be 17/36
Pulsified333
  • Pulsified333
my bad i didn't see the at least 8
anonymous
  • anonymous
ooh so otherwise would it be right?
Pulsified333
  • Pulsified333
I think but it would be 22/36= 11/18
anonymous
  • anonymous
ok ok :)
Pulsified333
  • Pulsified333
it says not correct
anonymous
  • anonymous
:(
anonymous
  • anonymous
isn't at least 8 = 15/36?
Pulsified333
  • Pulsified333
how?
Pulsified333
  • Pulsified333
8=5/36, 9=6/36, 10= 3/36, 11=2/36, 12=1/36
anonymous
  • anonymous
9 has 4 combinations
Pulsified333
  • Pulsified333
your right
Pulsified333
  • Pulsified333
26/36
anonymous
  • anonymous
15/36 + 11/36 - 6/36 = 20/36
Pulsified333
  • Pulsified333
5/9?
anonymous
  • anonymous
wait wait...
Pulsified333
  • Pulsified333
ok
anonymous
  • anonymous
yes I think 5/9.
Pulsified333
  • Pulsified333
I don't get this it says its wrong
anonymous
  • anonymous
:o is this an online thing?
Pulsified333
  • Pulsified333
yeah
anonymous
  • anonymous
ok try 26/36 then
Pulsified333
  • Pulsified333
i only have 2 more attempts
anonymous
  • anonymous
:( I don't get it the events are not mutually excessive so it should be 20/36 but if the test writer is dumb it might be 26/36...
anonymous
  • anonymous
I'm sorry I'm dumb too probably.

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