The class interval of a given observation is 10 to 15, then the class mark for this interval will be:
A. 11.5
B. 12.5
C. 12
D. 14
Answer:B
The class interval of a given observation is 10 to 15, then the class mark for this interval will be:
A. 11.5 B. 12.5 C. 12 D. 14
Explanation: Class mark = (Upper limit + Lower limit)/2