Answer:
[4 + (12 - 2) ÷ 5] ÷ 7
[4 + 6 / 5] / 7
[10 / 5] / 7
2 / 7
= 2/7 or 0.28571428571
Answer: The sample mean is 14.98
The second one is NOT standard deviation
Step-by-step explanation: Sorry thats all i got but good luck!
B.
C.