Answer:
12.50
Step-by-step explanation:
18.20-5.60= 12.50
The answer is 2-7x I'm 100% sure
100 seconds. The numbers on the left are seconds.
Answer: The standard error of the mean = 0.5
Step-by-step explanation:
Given : Sample size : n = 144
Standard deviation : 
The formula to find the standard error of the mean is given by :-

i.e. 
Hence, the standard error of the mean =0.5