The heights of 30 students of class IX are given below:
158,155,154,158,160,148,150,153,159,161,148,157,162,159,151,154,156,152,156
,160,152,147,155,163,155,153,157. prepare a frequency distributions table with 150-154 as one of the class intervals.

The heights (in cm) of 30 students of class VIII are given below: 150,152,154,152,148,149,150,155,159,160,152,154,160,149,150,152,155,145,154,145,148,153,155,150,160,154,152,149,152,148. Prepare a frequency table with 160-164 as one of the class intervals

The heights (in cm) of 9 students of a class are as follows: 155 160 145 149 150 147 152 144 148 Find the median of this data.