Answer:
b. 610, 50
Step-by-step explanation:
The mean score is the sum of all scores divided by the number of tests.
So if you increase the grade on each test, the mean will increase.
The standard deviation is the square root of the sum of the power of 2 of all scores subtracted by the mean(that is, the distance between each score and the mean) and divided by the number of tests.
As you increase each score by 10, the mean will change by 10. However, the distance between each score and the mean will stay the same, which means that the standard deviations remains unchanged.
In this problem, we have that:
Mean = 600
Standard deviation = 50
Scores increased by 10
So
Mean = 610
Standard deviation = 50
So the correct answer is:
b. 610, 50
Answer:
y=2/3x-6
Step-by-step explanation:
i hope this helps :)
We have to set up 2 different equations if we are to solve for 2 unknowns. The first equation is x = y + 4. One number (x) is (=) 4 more than another (y + 4). Since we have determined that x is larger (cuz it's 4 more than y), when we set up their difference, we are going to subtract y from x cuz x is bigger. The second equation then is
. In our first equation we said that x = y + 4, so let's sub that value in for x in the second equation:
. Expand that binomial to get
. Of course the y squared terms cancel each other out leaving us with 8y + 16 = 64. Solving for y we get that y = 6. Subbing 6 in for y in our first equation, x = 6 + 4 tells us that x = 10. Yay!
Answer:
-5x -30 > 80
-5x > 80 +30
-5x > 110
x > 110 /-5
x > -22
Step-by-step explanation: