Following information pertains to the daily income of 150 families. Calculate the arithmetic mean. {:("Income (in Rs.)",,"Number of Families"),("More than 75",,""150),("More than 85",,""140),("More than 95",,""115),("More than 105",,""95),("More than 115",,""70),("More than 125",,""60),("More than 135",,""40),("More than 145",,""25):}

Following information pertains to the daily income of 150 families. Ca

1.	Following information pertains to the daily income of 150 families. Calculate the arithmetic mean. {:("Income (in Rs.)",,"Number of Families"),("More than 75",,""150),("More than 85",,""140),("More than 95",,""115),("More than 105",,""95),("More than 115",,""70),("More than 125",,""60),("More than 135",,""40),("More than 145",,""25):}
Answer» Solution :Conversion of a CUMULATIVE Frequency Distribution into a Simple Frequency Distribution (Assumed Average, A = 110) `barX=A+(sumfd')/(sumf)xxC` `=110+(95)/(150)xx10` `=110+6.3` `=116.3` `:." Arithmetic mean = Rs. 116.3."`