please help me for solving this.. pls no spamm answers will be reported... answer correctly
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(a) Lower limit of the second class interval = 20 (second class = 20-30)
(b) The no. of students the data was collected = 5+10+4+15+12 (add all the no. of students from the given table) = 46 students
(c) class mark is the midvalue of the class interval, so, for the given class interval "30-40" the class mark is the middle number between the given group of numbers, which is 35
(d) students who got 40/ more mark than 40 = 15+12 = 27 students
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