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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
What do intersesting numbers mean?
It means the number has some property that somebody finds interesting. It doesn't make much sense to give a formal definition; different people will find different things interesting.
What does it mean that the probability of rolling the number four with two fare dice?
Fair dice are dice that are not weighted on one side to make a particular number more probable than the others.
The probablity of a four on one dice is 1/6.
The probability of a four showing on either or both of two dice is 1/6 + 1/6 = 1/3
(Note this is different from rolling a total score of four with two dice which can be achieved with 1+3, 3+1 or 2+2 which is 3 out of 36 combinations or 3/36)
How many feet are there in 9 kilometers?
There are 0.0003048 kilometres in one foot. Therefore, rounded to two decimal places, 9 kilometres is equal to 9/0.0003048 = 29527.56 feet.
Which chart type would you use to compare unrelated objects over time using a horizontal format?
A bar chart.
Are boy smarter than girls in math?
No. It all depends on your intelligence level. Just because your classes smartest kid is a boy doesnt mean they all are. Whoever says that is being pretty sexist. I am a girl myself and people even admit to me that I am the smartest kid in math. Surprisingly enough, my teacher even uses all my work as examples and uses my good intelligence as an example to the class.
At some ages, in some cultures, girls show superior mental abilities in mathematics. At other times, there appears to be no difference.
The fact that almost all historical mathematicians were men does not indicate that women were less intelligent, only that the societies were dominated by males, as most are even today. Only rarely (notably in royal families) were women able to reach their intellectual potential. In some areas of the world, even the education of women is still fiercely resisted.
"In 1980 two Johns Hopkins University researchers tried to settle the eternal nature/ nurture debate. Julian Stanley - who is well respected for his work with precocious math students of both sexes - and Camilla Benbow had tested 10,000 talented seventh-and eighth-graders between 1972 and 1979. Using the Scholastic Aptitude Test, in which math questions are meant to measure ability rather than knowledge, they discovered distinct sex differences. While the verbal abilities of the males and females hardly differed, twice as many boys as girls scored over 500 (on a scale of 200 to 800) on mathematical ability; at the 700 level, the ratio was 14 to 1. The conclusion: males have inherently superior mathematical reasoning ability." From:http://www.time.com/time/magazine/article/0,9171,953389,00.html
5/36
Two six-sided dice are rolled what is the probability that at least one die is odd?
Half the numbers are odd on each die.
(1 - (0.5 * 0. 5)) = 0.75
Probability of flipping a coin twice and getting tails both times?
P(tail) is 0.5. You want P(tail) AND P(tail) = 0.5 * 0.5 = 0.25 or 1/4.
What is a year with three digits?
Any year between and including A.D. 100 and 999. So, A.D. 387, 234, etc. Or, any year between B.C. 100 and 999.!
How many 4 number combinations are there starting with 77?
There are 100 permutations that start with 77.
There are 55 combination, though combination cannot be said to start with anything since combinations do not take account of the order of digits.
How many 2 digit numbers have no 2 at all?
72. (with the range of two digit numbers being from 10 to 99).
How many 3 digits numbers can be formed from numbers 3-7?
you can choose from 3, 4, 5, 6 and 7 and can place them on 3 digits
so 5 options over 3 digits. so 5*5*5 = 125 numbers
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If you're not allowed to use the same digit twice, then
The first digit can be any one of the five. For each choice ...
The second digit can be any one of the remaining four. For each choice ...
The third digit can be any one of the remaining three.
Total number of different arrangements = 5 x 4 x 3 = 60 .
I suppose you mean "proton number". That refers to the number of protons in the nucleus of an atom.
10. He could have picked all the reds and all the blues in 9 picks...
A marble is more dense and has less surface area, so it is not affected by air resistance as much as the feather.
