At the grocery store there are two different options for buying Coke. You can buy a 12 pack for $5.49 or an 18 pack for $8.59. W
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Answer:
In order to find the variance we need to calculate first the second moment given by:
And the variance is given by:
And the deviation would be:
Step-by-step explanation:
Previous concepts
The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.
The variance of a random variable X represent the spread of the possible values of the variable. The variance of X is written as Var(X).
Solution to the problem
For this case we have the following distribution given:
X 3 4 5 6
P(X) 0.07 0.4 0.25 0.28
We can calculate the mean with the following formula:
In order to find the variance we need to calculate first the second moment given by:
And the variance is given by:
And the deviation would be:
The correct answer is: [A]: " 
" .
_________________________________________________________
Explanation:
_________________________________________________________
We are asked to simplify:
→
_________________________________________________________
Note the following property of exponents:
_________________________________________________________
= 
; { b 
0 } .
_________________________________________________________
As such:
→
;
=
= 
= .
_____________________________________________________________
The answer is: " " ;
→ which is: "Answer choice: [A]: " " .
_____________________________________________________________
Hope this answer—and explanation—is of some help to you.
Please comment below or otherwise respond to me if you have any questions or if I can be of further assistance.
Best wishes!
_________________________________________________________
Explanation:
_________________________________________________________
We are asked to simplify:
→
_________________________________________________________
Note the following property of exponents:
_________________________________________________________
_________________________________________________________
As such:
→
=
_____________________________________________________________
The answer is: "
→ which is: "Answer choice: [A]: "
_____________________________________________________________
Hope this answer—and explanation—is of some help to you.
Please comment below or otherwise respond to me if you have any questions or if I can be of further assistance.
Best wishes!