check a website called math-way without the dash it might help
Answer:
25.5 days
Step-by-step explanation:
Mean number of days (μ) = 22 days
Standard deviation (σ) = 6 days
Z-score for the 72nd percentile (according to tabulated values) = 0.583
The z-score for any number of days, X, is determined by:

The value of X that is greater than 72% of the trial times is:

Therefore, 72% of all of these types of trials are completed within 25.5 days.
Answer:
The answer is the first day.
Answer:
The coefficient is equal to 
Step-by-step explanation:
we have

we know that
The coefficient is equal to

so
