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Statistics
Statistics deals with collecting, organizing, and interpreting numerical data. An important aspect of statistics is the analysis of population characteristics inferred from sampling.
36,756 Questions
If you Roll a 4 or higher on a six-sided number cube what is the probablity?
The probability of rolling a 4 or higher on a standard die is 1 in 2.
You use the sample mean as the estimate of the population mean; then as standard practice place confidence limits on the mean; most use 95%.
What are the possible numbers if the value of the tens digit is 60?
There are actually an infinite number of them. But if we leave out decimals
and negative numbers and stick exclusively to whole numbers, then there
are only ten. They are ... 60
61
62
63
64
65
66
67
68 and
69 . Oh no ! Wait a minute. Hold up, hee haw, whoa ! I'm wrong. Even if you stick to
only whole numbers, there are still an infinite number of them. Here are a few more
examples. The value of the tens digit is 60 in all of these: 160
161
263
462
1,065
9,760
21,869
314,167
2,718,281,828,459,065
.
.
etc.
If somebody rolls 2 standard six-sided dice what is the probability he obtains a sum of 7 or 11?
2 out of 12
Ans:
1 2 3 4 5 6 1 2 3 4 5 6
total no N of sums of two numbers assuming dice are indistinguishable:
N = 36
ways to get 7:
1 and 6 with a chance of (1/6)*(1/6) = 1/36
2 and 5 wih a chance of 1/36
4 and 3 with a chance of 1/36
whats the chance of getting 7 with either of these combinations:
1/36 + 1/36+ 1/36 = 1/12
what about 11:
6 and 5, which is the only way to get an 11:
the prob of this is (1/6)*(1/6) = 1/36
the prob of getting a 7 or an 11, with two dice:
1/36 + 1/12 = 1/9!
Hopefully someone will jump in if I've made a mistake.
OK, I've been told the answer is 2/9. If you do the same working as above, but you'll have to assume there are two ways to get each sum:
example, if you get a 7 from 2 and 5, then you can also get 7 from a 5 and 2. This means the dice are distinguishable!
What is the probability of flipping a coin twenty times and only getting heads twice?
20!/(18!*2!) * (1/2)^20 = 190/1048576 = 0.000181198...
So less than 1 in 5000.
1+1 lowest, 6+6 highest so 12 - 2 = 10
False.
How can numbers 2 5 6 6 equal 24 using each number once?
add 2+5+6+6+2+4 which equals 24.but you get the 2 and 4 from the 24 that's in the problem.
What are the three common multiples of 4 and 5?
20,40,60,80,100,120,140..........................................................................................................
What are all the factors and the first five multiples?
It would help to choose a number. Let's try 12.
1, 2, 3, 4, 6, 12
12, 24, 36, 48, 60
How do you prove the formula of area of hollow cylinder?
Surface area of a hollow cylinder = 2*pi*radius*length measured in square units.
What is the greatest four digit number that is divisible by 1 and 2 and 3 and 4?
9996
9996/1=9996
9996/2=4998
9996/3=3332
9996/4=2499
What does median mean in kid form?
To find a median, put the set of numbers in least to greatest. The number in the middle = median.
If the toppings are picked at random, then the answer is 9/14.
A sample which is similar to the target class in all relevant aspects is what?
Representative generalization supported on page 338; last para
How do you find the mode on a line plot?
The mode is the mathematical term for the value which appears most frequently. Depending which axis (X or Y) you are trying to find the mode of, the correct answer is the number that appears most frequently along any vertical line or horizontal line (respectively)
