Coding computers and gaming computers and just regular used computers
The correct answer is secondary
Answer:
Select SUM(HOURS), SUM(CHARGES) from employees
Explanation:
The table structure is not given. So, I will assume that the table name is "employees", the columns to retrieve are "hours" and "charges"
Having said that, the function to retrieve the total of column is the sum() function.
So, the query is as follows:
Select ----> This means that the query is to retrieve from the table
SUM(HOURS), SUM(CHARGES) --- This represent the records to retrieve
from employees ---- This represents the table to retrieve from.
Answer:
E = b-a
Explanation:
In this questions what we are been asked is for the expected value E, to solve the problem we need to recognize the random variables and their respective probability.
- x1 = roll a 1 -> P1 = 1/6
- x2 = roll a 2 -> P2 = 1/6
- x3 = roll a 6 -> P3 = 1/6
- x4 = roll a 1, 4 or 5 -> P4 = 1/2
E = P1*x1 + P2*x2 + P3*x2 + P4*x4
x1 is equal to zero (no points and the game stop), x2 is equal to E-a (lose a points, affecting the expected value), x3 is equal to E+b (win b points, affecting the expected value) and x4 is equal E (no points are lost and the game continues, therefore the expected value is not affected)
E = 1/6*0 + 1/6*(E-a) + 1/6*(E+b) + 1/2*(E)
1/6*E = 1/6*b - 1/6a
Solving for E
E = b-a
Conclusion: If you get a 3, 4 or 5 the game is unaffected (in terms of points), you need to pay special attention to x1, x2 and x3 (all with the same probability) that are the results that are going to affect your game.
