Instruction 6-3 the Number of Column Centimetres of Classified Advertisements Appearing on Appearing

Multiple Choice

Instruction 6-3
The number of column centimetres of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean 320 and population standard deviation 20 cm.
-Referring to Instruction 6-3,a single Monday is chosen at random.State in which of the following ranges the number of column centimetres of classified advertisement is most likely to be

A) 310 - 330.
B) 330 - 350.
C) 320 - 340.
D) 300 - 320.