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vladisking888
01.10.2019 •
Mathematics
Assume that there are 7 different issues of sports illustrated magazine, 8 different issues of newsweek, and 4 different issues of time, including the december 1st issue, on a rack. you choose 4 of them at random. (1) what is the probability that exactly 1 is an issue issue of sports illustrated?
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Ответ:
The probability is 0.3973
Step-by-step explanation:
We are going to solve this using counting theory.
If A is an event ⇒![P(A)=\frac{CasesWhenAOccurs}{TotalCases}](/tpl/images/0278/9454/9c592.png)
If an experiment 1 can takes place in n1 forms, a second experiment 2 can takes place in n2 forms, ..., a experiment-i can takes place in ni forms :
The total forms to take place all the experiments are n1 x n2 x ... x ni
This is call the multiplication principle
Let's define the combinatorial number :
nCr number is the way to choose r objects from a set of n objects
Now let's define the event A : ''1 is an issue of Sports Illustrated when I choose 4 of them at random''
From 7 different issues of Sports Illustrated I choose 1
From the others issues (8+4) I choose 3
19C4 number is the way to choose 4 issues from a set of 19
The probability exactly that 1 is an issue of Sports Illustrated is
Ответ:
71-100
Step-by-step explanation:
random number ranges within 1 to 100 need to be assigned for each event.
From the table , we can see that
for Lemon cremes cookie group , the probability is 0.30
That is 0.30 * 100 = 30 %
30% is 30 out of 100 cookies are Lemon cremes
Now we check the numbers that has 30 cookies in difference
71 - 100 is 30
so 71 to 100 will be assigned to the Lemon Cremes group