Okay, the problem is:
Stefan polled 113 student about the number of siblings they have. Use the table to compare the probability that a student has no siblings to the probability that a student has three siblings.
The table shows that the number of students that had 0 siblings is 14 and the number of students that had 3 siblings is 15. So, what I'm doing is dividing 14 by 29 and 15 by 29, to find out the probability for each and they come up with really large decimals. Am I doing something wrong?
2007-08-13 13:02:17 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Well, yes, 14/29 and 15/29 does make an infinitely-repeating decimal, but don't let that bother you. One's a tad under 1/2, the other a tad over. Am I getting your point correctly? And as mentioned above, you should be using the entire sample of 113, as in 14/113 and 15/113.
2007-08-13 13:09:49 · answer #1 · answered by Gary H 6 · 0⤊ 0⤋
You should be comparing each number to the total number of students polled.
You can't just lump the 14 0's and 15 3's together and forget about the rest.
14/113 and 15/113.
Probability of a student having 0 siblings is: 14/113 students = 12.389%
Probability of a student having 3 siblings is: 15/113 students = 13.274%
So comparing the two, you can see that the two groups are only about 0.9% different or so (depending on rounding).
2007-08-13 13:06:32 · answer #2 · answered by gaelicspawn 5 · 0⤊ 0⤋
Probability no siblings is 14/113
Probability 3 siblings is 15/113
You say you want to compare these two probabilities. I'm not sure what you mean by that, but one can see that they are nearly equal. The ratio of the zero siblings to the three siblings is .93333333333333
2007-08-13 13:21:28 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
percentage of number of students with zero is 14/113 =
12.4%
percentage of number of students with 3 is 15/113 = 13.3%
percentage of students with 1, 2, or more (but not 3) siblings is
100% - 12.4% - 13.3% = 74.3%, but they are not asking this.
compare zero sibling percentage to 3 sibling percentage
12.4% / 13.3% is 14/113 / 15/113
after canceling the 113's out 14/15.
2007-08-13 13:18:16 · answer #4 · answered by Kent H 6 · 0⤊ 0⤋
yes, gaelicspawn is correct. P(0 sibs) = 14/113 and P(3 sibs) = 15/113 for this set of people. These are also your best point estimates for the population from which they data came.
2007-08-13 13:12:04 · answer #5 · answered by hemidemisemiquaver 2 · 0⤊ 0⤋
try 14/113 and 15/113
2007-08-13 13:10:05 · answer #6 · answered by zelk z 2 · 0⤊ 0⤋
(a million/3 x a million/2)x2 a million in 3 danger of selecting the coin, a million in 2 danger of having a head. + (a million/3x1) a million in 3 danger of selecting coin, specific that that is going to likely be a head. 2/6 + a million/3 = 2/3 You have been appropriate.
2016-11-12 06:13:53 · answer #7 · answered by ? 4 · 0⤊ 0⤋
Ask your teacher, or really smart friend, becuase the way you explain it is a little confusing,
2007-08-13 13:05:32 · answer #8 · answered by Anonymous · 0⤊ 0⤋