Answer:
C is correct.
Step-by-step explanation:
Khan Academy said so.
Answer:

Step-by-step explanation:
You can understand the statement from many perspectives, but in terms of proposition logic it is best to understand it as "negation of a" or " b" in mathematical terms is written like this

You can show that they are logically equivalent because they have the same truth table.
Answer:
B
Step-by-step explanation:
In the attached file
Answer:
the mean = 9, and the mean deviation = 3.75
Hope this helps! :)