Question 33250
5,10,15,20...4 possibilities from 20 cards: P = 4/20 --> P=1/5


P(Blue) = 4/13
P(not yellow) = 2/13+4/13 = 6/13
P(getting 2 blue) assuming not replacing first marble = 4/13 * 3/12 = whatever that is


Roll 2 dice... 36 outcomes. How many add up to 4? Look at the following list of combinations, where order of numbers is "first dice" then "second dice":
1+3
2+2
3+1

so, 3 outcomes from 36 --> P(4) = 3/36 --> 1/12


P(defective radio) = 3/75 --> 1/25


1.5% is 1.5 out of 100
this means that 1.5 out of 100 are defective
so in 100, we expect 1.5 defective
so in 200, we expect 3 defective
so in 20,000 we expect 300 defective.


How many ounces is a pound? 16? If it is:

4 pounds is 64 ounces.
We have 38oz, so we need a further 26oz.


jon