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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.
36,755 Questions
How many strings of three decimal digits begin with an odd digit?
There are 500 of 3-digit numbers begin with an odd one (100-199, 300-301, 500-599,700-799, and 900-999).
In terms of "how many strings of", may filter or expand the above answer.
Is the mean distribution has equal number above and below?
No.
For example, the mean of 1,1,1,1,1,7 is 12/6 = 2: one above and five below.
Is the mode have to be always one number in a set of numbers?
No. The mode is the number that occurs most often is a set of numbers. If there are two numbers that occur the most in a set and they both occur the same amount of times, then they are both considered to be modes.
Ex: What is/are the mode(s) in the following set of numbers?
Set: 3 6 7 4 7 0 4 7 2 1 5 6 8 3 8 0 9 3
Answer: the modes are 3 and 7; they occur the most amount of times (3 in this case) and they both occur 3 times
What is the probability of drawing 2 cards that are all kings from a deck of cards?
The probability of drawing a king on the first draw is 4/52 = 1/13.
The probability that the next card is one of the 3 remaining kings is 3/51 = 1/17.
The probability of both events is (1/13)*(1/17) = 1/221
How many possible alpha numeric combinations using upper case letters and numbers for two chacters?
Letters - 26
Numbers - 10
Total chacters - 36
If characters can be repeated (QQ and 44 are acceptable): 36 x 36 = 1,296
If characters can't be repeated (GG and 99 not acceptable): 36 x 35 = 1,260
If characters can't be repeated and the sequence
doesn't matter (X7 and 7X are considered to be the same): 630
What are artificial variable used in operational research?
Artificial Variables are used to get an initial basic variable from
the constraints while preparing the initial basic feasible solution table. Constraints of >=
type and = type don't provide any basic variable. So, artificial variable is added
arbitrarily to get the basic variable
What are the steps finding a average?
The steps to finding an average of a set of numbers is easy. Your first step is to add all the numbers together. Let's look at an example.
2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 18, 20 = 142.
Now take the total of your numbers, 142 in this case, and divide it by the total amount of numbers you added.
There are 13 numbers above that we added. So 142/13 = 10.9. So the average of all those numbers is roughly 11.
How did Czarnowski and triantafyllou decide to test their hypothesis?
To test their hypothesis Czarnowski and Triantafyllou used the Scientific Method.
Also since i mentioned if you are wondering the steps of the Scientific Method are:
- Question
- Research
- Hypothesis
- Experiment
- Analyze your data
- Conclusion
What are the odds of rolling a seven or eleven on a pair of dice?
With two dices, there are 36 ways they can be rolled; of these 36 ways:
- Seven can be made in 6 ways (1+6, 2+5, 3+4, 4+3, 5+2, 6+1)
- Eleven in 2 ways (5+6, 6+5)
Probability of seven or eleven:
p = (6 + 2)/36
= 8/36
= 2/9
How do you find the area of each face on a box?
Each face of a box is a rectangle .
The area of a rectangle is (its length) times (its width).
Measure the length and width of each face, and multiply (length times width).
If you think about what you're doing, and plan it carefully, you only have to make
three measurements and you'll have the whole box covered ... all six faces.
How come Jason voorhees can't talk in the movie Friday the 13th?
It may be because of his physical deformities (to do with the tongue, mouth or vocal chords) or because he was never taught properly. He never went to school because his mother didn't allow him to, so he was never taught to talk.
What does internal error mean?
Programs usually manage their own errors displaying informations with alerts and error messages. When an unexpected error happens and the operative system don't know how to go on, a system error message is shown. Usually, after that, the program who caused the problem is stopped. Windows has a memory management systems that prevents programs to access other programs' memory space. If a program try to access a forbidden memory cell, an exception is thrown. Some other operations can throw exceptions, like a division by zero, for example.
What is the statistical function that accurately measures what it is intended to measure?
There is none. If an accurate measure was possible then statistical techniques would not be required. A maximum likelihood estimate is probably better than other statistical estimates.
What is the ratio of eaches to rolls?
The ratio of eaches to rolls depends on the specific quantities being compared. For example, if you have 100 eaches and 20 rolls, the ratio would be 100:20, which simplifies to 5:1. To determine the exact ratio, you need to know the number of eaches and rolls in question.
What types of information can be collected through qualitative observation?
Qualitative observations are the reactions that you see occuring. They mey be melting,bubbles, fizzing,smoke, the colour of the solution,and anything change you see that occurs. Don't talk about anyhting you can not see.
How many 6 number combinations can be made from six numbers?
You dont say whether zero is included or whether a digit may appear twice. These are the various answers:
No zero, no digit more than once in same number: This is any 6 from 9 in any order which is factorial 9 divided by 6 ie 60480
No zero, digit may be repeated: 9 to the sixth power: 531441
Zero allowed in any position, no digit more than once in same number: This is any 6 from 10 in any order, which is factorial 10 divided by 24 ie 151200
Zero allowed in any position, any digit may be repeated: 10 to the sixth power, ie 1000000.
Finlly, if you regard 123456 as the same combination as 123654, then answer is any 6 from 9 which is a mere 84
* * * * *
There is only 1 combination of 6 digits out of 6. Order does not matter in combinations so 123456 is the same as 342516 ect. One of the consequences is that there are no "leading" digits and so the presence, or otherwise, of 0s is irrelevant.
If, instead of 6 out of 6, the question were about 5 or fewer out of 6 then whether or not the 6 were all distinct will matter.
