The probability is 0.0008.
I used a binomial probability on this one, since there are two outcomes (either pass or fail); the events are independent (the probability of one person passing does not influence the probability of another passing); and there are a fixed number of trials (in this case, 20).
For binomial probabilities, we use the formula:

With our information, we have:
Answer: 2/3
Explanation: Assume that the number of smarties he picked is c.
Now, we are given that:
1- He picked 3 times as many cola bottles as smarties. This means that:
Number of cola bottles he picked = 3s
2- He picked twice as many smarties as marshmallows. This means that:
number of marshmallows he picked = 0.5s
Now to get the proportion o f cola bottles, we will divide the number of cola bottles by the total number of sweets as follows:
proportion of cola bottles =
Hope this helps :)
This graph is a V that is opening downward and the point is at the point (0,0)
The slope of the line is 4/1.
An easy way to find the slope of a line is something called "rise-over-run." From the lowest point, how many spaces does it have to move up in order to be horizontally-on-the-line with the highest point? 4.
How many spaces across? 1...
4 = rise
1 = run
4 RISE
-- -------
1 RUN