The marks (out of 20) obtained by a group of students in a math test are 12, 14, 15, 12, 16, 20. Find the: a) Range of marks obtained b) Mean marks obtained by the group
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a) range= maximum - minimum
range= 20-12
range = 8
b) mean mark = sum of observation/numberof observtion
mean= 12+14+15+12+16+20/6
mean= 89/6
mean =14
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