![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The standard deviation of a set of data 13, 14, 15, 16, 17 is () A. 0B. 10C. 2D. 2
X = 15 (13 + 14 + 15 + 16 + 17) = 15, variance S2 = 15 [(13-15) 2 + (14-15) 2 + (15-15) 2 + (16-15) 2 + (17-15) 2] = 15 [4 + 1 + 0 + 1 + 4] = 2, so the standard deviation of the five data is s = S2 = 2
Mathematics: what does standard deviation mean?
Square root
If the probability of a appearing at least once in four independent repeated events is 0.59, what is the probability of a appearing in one test
The probability of not appearing at one time is 1-0.59 = 0.41 = the fourth power of P -- P is the probability of not appearing at one time
Find out P and then use 1 - P to find it. Just tap it with a calculator
It is known that the probability of event a occurring in one experiment is 0.7, and that event a happens in four independent recidivists
Twice probability
2
C 4 × 0.7 ×0.7×（1-0.7）×（1-0.7）=0.2646
You can tell me what you don't understand
There is a formula for this
P (x = k) = CNK * P ^ k * q ^ (n-k) CNK is the number of combinations n, and the meaning of K formulas is the probability of the occurrence of K events in n independent repeated tests
A meaningful story and its implication
Any one, whatever
In a seminar, a famous speaker held a $20 bill in his hand without saying a word of opening remarks. Facing 200 people in the conference room, he asked, "who wants the $20?" one hand raised. He then said, "I'm going to give the $20 to one of you, but before that, please allow me to
What is the value of R in the formula PV = NRT in chemical calculation? What is the application of each unit?
314, P in PA, V in m ^ 3, N in mol, t in K (Kelvin temperature)
What is independent thinking? Name the concept and give some examples
Independence means that you can complete the process of thinking by yourself without the help of others. For example, when you buy an apple, people say it's sweet and delicious, but you need your own judgment. Maybe you don't like it. There's another thing that some people say it's right and some people say it's wrong, but what's the result of your own analysis? It's not influenced by others, Tell yourself the answer with your own mind
CPK formula,
What does x in CA = (x-u) / (T / 2) stand for? Is there an example to calculate CPK
Give an example to prove the importance of experimental spirit
Take a positive factual argument!
In order to refute Aristotle's view that the falling speed is proportional to the weight of an object, Galileo dropped two objects of the same material and different weight at the same time in the Leaning Tower of Pisa, Italy. It is proved that when objects of different weights fall freely in the air, the weight has nothing to do with the falling speed
How to calculate s in CPK formula
S means standard deviation. The simplest calculation method is to input data into excel table, and then calculate it through function standard deviation. Calculator can also be used for troublesome points. However, the calculation of CPK generally uses σ,
σ = rbar / D2, while the PPK is calculated by s standard deviation, and the error between the two results may not be very large
RELATED INFORMATIONS
- 1. Independent repeated experiment and binomial distribution Is the independent repeated experiment a kind of binomial distribution? If not, what is the difference between them?
- 2. 1. The edge length of cube abcd-a'b'c'd 'is 1. If e is the midpoint of DD', then the distance from B 'to plane Abe is \. 2. In the xoy rectangular coordinate system, it is known that a (4,0), B (0,4), the light ray emitted from point P (2,0) is reflected by the straight line AB, then it is reflected by the straight line ob, and then it is returned to point P, then the path of the light ray is \. 3. Let a, B and C be unit vectors, and a · B = 0, then the minimum value of (A-C) · (B-C) is uuuuuuuuuuuuuuuuuuuuuuuuuu. 4. If the function f (x) defined on R belongs to R for any X1 and X2, f (x1 + x2) = f (x1) + F (x2) - 1 holds, and if x > 0, f (x) > 1. 1) It is proved that f (x) - 1 is an odd function; 2) It is proved that f (x) is an increasing function on R; 3) If f (4) = 5, solve the inequality f (3m ^ 2-m-2)
- 3. It is found that one m-bacteria can self replicate while killing the virus. It is known that one m-bacteria can kill a virus and split into two m-bacteria. What is the maximum number of m-bacteria that can be produced by one m-bacteria and 2047 viruses_______ My answer is 2 * 2047 = 4094. What's wrong,
- 4. High school mathematics combination C 6 superscript 10 subscript is how many how to calculate
- 5. In word, how to use superscript and subscript at the same time and make them aligned. The most important is the latter
- 6. The solution of classical probability problem, Four different language books and two different mathematics books. What's the probability of taking out any two of them,
- 7. C24 (2 is superscript, 4 is subscript) for formula and answer (urgent)
- 8. The addition formula of ABCD four event probability P（A+B+C)=pA+pB+pC-pAB-pAC-pBC+pABC
- 9. In the same formula (...) ）Put the same number in. 42 ten (...) )=56—(…… )
- 10. Suppose that a and B events are independent of each other, and the probability of only a and only B is 1 / 4, calculate the probability of a event and B event
- 11. What is the standard deviation in mathematics?
- 12. Must the standard deviation be less than the average
- 13. What is the point estimate of the sample standard deviation? A question mentioned in the senior three exam, as mentioned above, people who know it tell me, Sheila
- 14. There are two groups of data. The average value of the first group is larger than that of the second group. Is the standard deviation of the first group larger than that of the second group? Must it be big?
- 15. The probability of success in one thing is 1%, what is the probability of success in 100 times
- 16. There are two children in a family, one of whom is known to be a girl, and the probability that the other child is also a girl is? (the probability that each child is a boy is equal to that of a girl) Our teacher talked about four basic events: male, male, female, male and female. Then there are three other events except "male", so it is 1 / 3 But I think men and women, as well as women and men, belong to the same basic event. It should be one half,
- 17. Given that a family has three children, and one of them is a girl, what is the probability of having at least one boy? List analysis method The total number of male and female distribution list of 3 children is the third power of 2, which is 8. Why do we consider 8 kinds of children? Why are there differences between male and female! The answer is 6 / 7, which is the birth probability of several children. One of them is female, so there is no male list 1 male and female 2 women and men 3 men and women 4 women and men 5 women 6 men and women 7 women and men Because one of them was a girl and came to seven conclusions, and six of them were boys So it's 6 / 7 Why do you think about eight, men and women and men and women
- 18. In each test, the probability of occurrence of event a is p, and the probability of occurrence of odd times of event a in n independent tests is calculated
- 19. (both words and symbols are required!)
- 20. The symbolic expression and reaction phenomenon of the chemical reaction of carbon dioxide into clarified lime water are obtained