What is class Mark? Share with your friends Share 12 Sunanta Meitei answered this Hi!The mid-value of a class interval is known as the midpoint (class mark) of that class interval. If a – b is a class interval, then the class mark x is found by using the formula Cheers! 20 View Full Answer Shakuntala Shukla answered this The mid-value of a class interval, or the integral value nearest the midpoint of the interval.ha ha -14