Answer:
The standard error of the mean = 5.14 mins
Step-by-step explanation:
Number of random sample (n) = 20
Mean(X) = 31.25 mins
Standard deviation (α) = 23.7 mins
Standard error of mean =
standard deviation / √sample size
= 23.7/√20
= 23.7/4.4721
= 5.14 mins

Hope you could get an idea from here.
Doubt clarification- use comment section.
8x8x8=512
hope this is what its asking
Answer:
-3/15 is the difference between 6/15-9/15
Answer: 3/8
Step-by-step explanation:
It’s the answer :>