Checkpoint: tables, marks and three means
Five ideas so far, one question on each. Retry as often as you like.
A reading of 20 sits on the boundary of 10-20 and 20-30. Which class gets it?
What is the class mark of the class 30-50?
Classes 0-10 and 10-20 have frequencies 4 and 6. What is the mean?
The same table with a = 15. The f × d column adds to −40. What is the mean?
The deviations are −10, 0, 10 and 20. Which step h divides every one?
0 of 5 answered