Question

During a medical checkup, height of 35 students of a class were recorded as follows : Height (in cm): 90-100, 100-110, 110-120, 120-130, 130-140, 140-150 Number of Students: 3, 2, 4, 5, 14, 7 Find the difference between the mean height and median height.

Medical check-up was carried out for 35 students of a class and their weights were recorded as follows : Weight (in kg): 38-40, 40-42, 42-44, 44-46, 46-48, 48-50, 50-52 Number of Students: 3, 2, 4, 5, 14, 4, 3 Find the difference between the mean weight and the median weight.

Following table shows the absentees record of 40 students in an academic year :

If the mean of 2, 9, x+6, 2x+3, 5, 10, 5 is 7, then the value of x is :