find the mean of following data
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Mean of values in x1:
2+4+6+10+12/5
= 34/5 = 6.8
Mean of values in f1:
1+2+2+3+3/5 (since values must be in ascending order)
=11/5 = 2.2
Mean of total data (x1 + f1):
2+4+6+10+12 + 1+2+2+3+3/10
= 45/10 = 4.5
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