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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
The range.
What is the standard deviation?
The standard deviation of a set of data is a measure of the spread of the observations. It is the square root of the mean squared deviations from the mean of the data.
What is the significance of the odd second digit in highways?
On the U.S. interstate system, even numbers indicate East/West routes; Odd numbers represent North/South routes; 3 number routes generally indicate belt-routes or local alternates.
To disguise or conceal under a false appearence; dissemble
dis·sim·u·late To disguise (one's intentions, for example) under a feigned appearance.
To conceal one's true feelings or intentions.
How many possible outcomes are there rolling six sided cube twice?
- If each throw is unique, then there are 36 distinct outcomes(6 x 6 = 36).
- If each throw is not unique (you count 1-4 same as 4-1) then 21 different possible.
- If you're just interested in the sums, then 11 different possible (1+1 =2 up to 6+6=12)
But any time you want to calculate probabilities with two die throws, you need to use the 36 distinct outcomes.
How many positive four digit numbers have 3 as their first digit and 4 or 5 as their third digit?
possibly than 20,
3040
3041 etc
3050
3051 etc
How do you convert a z-score into an x-score?
Suppose m is the mean and s the standard deviation of a random variable, X, which is normally distributed. Then, given Z,
X = m + sZ
The random variable Z is the standard normal score. Find the number a if P Za equals 0.9830?
a = ±2.12, depending on the inequality for Z.
How many 5 digit numbers are there with distinct numbers?
I suspect you mean "without repeated digits", and I'll answer it that way.
Here's how I would construct all the 5-digit numbers without repeated digits:
The first digit can be any one of 9 (1 thru 9 but not zero). For each of these . . .
The second digit can be any one of 9 (zero thru 9 but not the same as the first one). For each of these . . .
The third digit can be any one of the remaining 8. For each of these . . .
The fourth digit can be any one of the remaining 7. For each of these . . .
The fifth digit can be any one of the remaining 6.
Total number of possibilities = (9 x 9 x 8 x 7 x 6) = 27,216
How many numbers up to 100 have 1 in their units digit?
10.
They are 1, 11, 21, 31, 41, 51, 61, 71, 81, and 91.
Which car will move first if their are 15 marbles while the other has 10 marbles?
I presume you mean they're on a slope. In which case, the car with the most marbles will move first, because it's heavier.
How many times digit 1 is used to make all 2 digit numbers?
19 times
10,11 (is 2),12,13,14,15,16,17,18,19,21,31,41,51,61,71,81 and 91
What are the odds of getting an even number on an eight sided die four times in a row?
One half, 1:2, 1/2, etc...
How many equal groups of cards can be made from a standard deck of 52 cards?
52/1 = 52
52/2 = 26
52/4 = 13
52/13 = 4
52/26 = 2
52/52 = 1
6 groups. 1 group of 52 counts, right?
