Answer:3 hour
Step-by-step explanation:
Hope that helps
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:
200
Step-by-step explanation:
200×4%=8
8×3=24
The original amount is $200