heh guess I should be posting what I've done on these instead of just posting the question :)
ok well all I know is that its .8 (x) + .4 (x) , but I have no idea what the variable x is. I can't just add .8 and .4 because that would be greater then one. So i guess I just need help figuring...
well the first part I can get, just take the gold coin from the pouch and add it to the purse and then you have 10 gold coins and a total of 14 coins so the probabilty is 10/14
the 2nd part seems much more difficult, I am not even sure how to start that part...
There is a 80% chance that Wednesday's mail will be delivered before noon on Wednesday and a 40% chance that Thursday's mail will be delivered before noon on Thursday. If these probabilities are independent, what is the probability that the mail will arrive before noon at least one of those two...
A pouch has 9 gold and 3 silver coins. A purse has 9 gold and 3 silver coins. A coin is drawn at random from the pouch and put in the purse. A coin is then drawn from the purse. Enter your answers as fractions.
Given that the coin chosen from the pouch was gold, what is the probability that...
You have 10 pink balls and 15 purple balls. How many distinguishable arrangements are possible if two pink balls cannot be next to each other?
I know the answer is 8008 but I have no idea how to get this
ok here is the question
The annual interest on Sid Carrington's three investments amounted to $21300: 5% ona savings account, 9% on mutual funds, and 11% on bonds.If the amount of Sid's investment in bonds was triple the amount of his investment in the savings account, and the interest earned...