The heights of 50 students , measured to the nearest centimetres, have been found to be as follows :
`{:(161,150,154,165,168,161,154,162,150,151),(162,164,171,165,158,154,156,172,160,170),(153,159,161,170,162,165,166,168,165,164),(154,152,153,156,158,162,160,161,173,166),(161,159,162,167,168,159,158,153,154,159):}`
(i) Represent the data given above by a grouped frequency distribution table, taking the class intervals as 160-165,165-170 ,etc.