125,127,130,135,142,153,165

The heights (in cm) of 22 students were recorded as under: 125, 132, 138, 144, 142, 136, 134, 125, 135, 130, 126, 132, 135, 142, 143, 128, 126, 136, 135, 130, 130, 133. Prepare a frequency distribution table, taking equal class intervals and starting from 125-130, where 130 is not included.

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.

Find the 20^(th) percentile of the following data : {:("Height (in cm)",135,140,145,150,155,160,165,170),("No. of students",7,20,32,48,36,28,24,4):}

What would be the IUPAC names and symbols for the elements with atomic number 122, 127, 135, 149, 150 ?

Answer the following : Find variance and S.D. for the following set of numbers. 125, 130, 150, 165, 190, 195, 210, 230, 245, 260

Find the mean deviation about the mean for the data : Height 95-105 105-115 115-125 125-135 135-145 145-155in cms Number of Boys 9 13 26 30 12 10