General Math

[roshanajabbour]

16 In Mathsville, there are on average eight rainy days in October.
Which expression could be used to find a value for the probability that it will rain on two
consecutive days in October in Mathsville?
(A) 8/31× 7/30


(B) 8/31 x 7/31


(C) 8/31 x 8/30


(D) 8/31 x 8/31

[jakesilove]

16 In Mathsville, there are on average eight rainy days in October.
Which expression could be used to find a value for the probability that it will rain on two
consecutive days in October in Mathsville?
(A) 8/31× 7/30


(B) 8/31 x 7/31


(C) 8/31 x 8/30


(D) 8/31 x 8/31

Hey! If there are 8 rainy days in 31 days on average, then all we can say for sure is that the probability of it raining on any given day is 8/31. Therefore, to rain on two consecutive days, the probability will be the likelihood of raining on the first day, times the probability of raining on the second day. So, the answer is (8/31)*(8/31) which is D!

[roshanajabbour]

Hey! If there are 8 rainy days in 31 days on average, then all we can say for sure is that the probability of it raining on any given day is 8/31. Therefore, to rain on two consecutive days, the probability will be the likelihood of raining on the first day, times the probability of raining on the second day. So, the answer is (8/31)*(8/31) which is D!

Cheers! I think i may have mixed myself up with another type of question whilst determining this.

[pughg16]

Cheers! I think i may have mixed myself up with another type of question whilst determining this.

Don't worry, I made the same mistake when I was answering this question! I did 8/31 * 7/30, but my maths teacher told me how to do it!!