2y+14=28
-14=-14
—————-
2y=14
14/2=y
Y=7
Answer:
A
Step-by-step explanation:
A is the answer
Answer:
b. Kathy
Step-by-step explanation:
We compare each of their score by how far away from the mean when in term of the standard deviation. Using the following formula

For John he is (85 - 75)/5 = 2.
For Kathy she is (80 - 50)/10 = 3.
Since Kathy is 3 standard deviation better than her class' average, while John is only 2's. We conclude that Kathy did better.
It would be 2/4. 2/4 simplifies to 1/2.