Answer: B.
Step-by-step explanation:
I hope this helps!
Answer: A. 6.5
Step-by-step explanation:
Here, the given set = { 15, 19 3, 12, 17, 2, 2, 8}
Mean, 
Number of elements, n = 8

Thus, the standard deviation, 
⇒ Option A is correct.
Answer:
I believe the answer would be A and C
Step-by-step explanation:
Do u have a photo of a triangle or something cuz im lost