Find the mode of 90, 55, 65, 55, 75, 75, 35, 55, 90.

The weights (in kg) of 10 boys from a team are recorded as follows : 55, 53, 48, 47, 54, 49, 64, 45, 55, 50. Find their mean weight.

Find the median of the observations,59, 75, 68,70, 74, 75, 80.

Find the median of the given data : 50 , 70 , 90 , 94 , 40 , 65 , 70 , 80 , 85 , 95 .