How we make decisions is usually based on data, how you read that data is heavily misled by averages, try using data in a more insightful way.
Learn more about lean with The Joy of Standards, available on Amazon in paperback, Kindle and iPad (Kindle App).
https://www.amazon.com/Joy-Standards-problems-effort-problem/dp/1523372680
7. Look for trends
a line indicating the general course or tendency of something
yesterday
response
time
Average says we are
OK
Trend tells us we get
slower as the day
progresses
8. Look for range
the difference between the highest and lowest values in the data set
yesterday
response
time
Average says we are OK
Range tells us we are
inconsistent and will have
happy and unhappy
customers
9. Look at outliers
unusual items which are outside the data range we normally expect
yesterday
response
time
Average says we are OK
Outliers tell us a problem
happened earlier today
10. “in God we trust, all others
must bring data”
W. Edwards Deming