In a certain investigation, 460 persons were involved in the study, and based on an enquiry on their age, it was known that 75% of them were 22 or more years. The following frequency distribution shows the age composition of the persons under study. Find the mean and modal life of condensers. Mid age in years 13 18 23 28 33 38 43 48 No. of persons 24 f 90 122 f2 56 20 33