Answer:
The answer is b.
Step-by-step explanation:
Answer:
10
Step-by-step explanation:
X=10
-3 on both sides
Then -6(x+4)+3 to the other side
Answer: A. 1.2
Step-by-step explanation:
Given : Sample size : n= 64
Standard deviation: 
The formula to find the standard error of mean is given by :-

Therefore, the standard error of the mean= 1.2
Hence, A is the right option.