A + -5 = -12
A - 5 = -12
A = -7.
This is the solution.
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.
Answer:
187.5
Step-by-step explanation: