The following table gives the distribution of expenditures of 80 employees of a company on meal per day.
Expenditures (in Rs.) 100−120 120−140 140−160 160−180 180−200
Number of employees 10 30 15 20 5
Find the mean expenditure on meal per day.
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the answer is 45
formula for mean is
a+l×(sum of fi×di'/sum of fi)
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