What are the mean and standard deviation of {34, 98, 20, -1200, -90}?

Trevor Rush 2022-08-14 Answered
What are the mean and standard deviation of {34, 98, 20, -1200, -90}?
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Answers (2)

Jaxson White
Answered 2022-08-15 Author has 15 answers
Explanation:
Calculate the mean as the sum of the numbers divided by the number of observations
M e a n = 34 + 98 + 20 1200 90 5 = 227.6
Calculate the standard deviation as the square root of the sum of the squared difference each observation and the mean divided by the number of observations.
Standard deviation
= ( 34 227.6 ) 2 + ( 98 227.6 ) 2 + ( 20 227.6 ) 2 + ( 1200 227.6 ) 2 + ( 90 227.6 ) 2 5 = 489.9492
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balafiavatv
Answered 2022-08-16 Author has 2 answers
Data: S={34,98,20,-1200,-90}
Mean: s 5 = 227.6
Variance square differences are ( 34 ( 227.6 ) ) 2 = 68434.56
( 98 ( 227.6 ) ) 2 = 106015.36 , ( 20 ( 227.6 ) ) 2 = 61305.76 ,
( 1200 ( 227.6 ) ) 2 = 945561.76 , ( 90 ( 227.6 ) ) 2 = 18933.76
Average variance square differences is
σ 2 = 1200251.2 5 = 240050.24
Standard deviation is σ 2 = 489.9492
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New questions

Euclid's view and Klein's view of Geometry and Associativity in Group
One common item in the have a look at of Euclidean geometry (Euclid's view) is "congruence" relation- specifically ""congruence of triangles"". We recognize that this congruence relation is an equivalence relation
Every triangle is congruent to itself
If triangle T 1 is congruent to triangle T 2 then T 2 is congruent to T 1 .
If T 1 is congruent to T 2 and T 2 is congruent to T 3 , then T 1 is congruent to T 3 .
This congruence relation (from Euclid's view) can be translated right into a relation coming from "organizations". allow I s o ( R 2 ) denote the set of all isometries of Euclidean plan (=distance maintaining maps from plane to itself). Then the above family members may be understood from Klein's view as:
∃ an identity element in I s o ( R 2 ) which takes every triangle to itself.
If g I s o ( R 2 ) is an element taking triangle T 1 to T 2 , then g 1 I s o ( R 2 ) which takes T 2 to T 1 .
If g I s o ( R 2 ) takes T 1 to T 2 and g I s o ( R 2 ) takes T 2 to T 3 then h g I s o ( R 2 ) which takes T 1 to T 3 .
One can see that in Klein's view, three axioms in the definition of group appear. But in the definition of "Group" there is "associativity", which is not needed in above formulation of Euclids view to Kleins view of grometry.
Question: What is the reason of introducing associativity in the definition of group? If we look geometry from Klein's view, does "associativity" of group puts restriction on geometry?