The table below gives the percentage distribution of female in the primary schools of rural areas of various states and union territories (U.T) of India . Find the mean percentage of female teachers using all the three methods.
`{:("Percentage of female teachers","Number of States/U.T"),(15-25,6),(25-35,11),(35-45,7),(45-55,4),(55-65,4),(65-75,2),(75-85,1):}`
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The following table gives the literacy rate (in percentage) of 35 cities . Find the mean literacy rate . {:("Literacy rate in %","Number of cities"),(45-55,3),(55-65,10),(65-75,11),(75-85,8),(85-95,3):}

The following distribution gives the state-wise , teacher -student ratio in higher secondary schools of India . Find the mode and mean of this data . Interpret the two measures . {:("Number of students","Number of states"),(15-20,3),(20-25,8),(25-30,9),(30-35,10),(35-40,3),(40-45,0),(45-50,0),(50-55,2):}

The following table shows the ages of the patients admitted in a hospital during a year : {:("Age (in years)","Number of patients"),(5-15,6),(15-25,11),(25-35,21),(35-45,23),(45-55,14),(55-65,5):} Find the mode and the mean of the data given above . Copmare and interpret the two measures of central tendency .

The weights of 50 custard apples are given below . ( In grams ) 35 , 40 , 45 , 40 , 50 , 55 , 60 70 , 75 , 80 , 90 , 94 , 45 , 60 , 65 , 35 , 65 , 35 , 25 , 24 , 34 , 45 , 54 , 63 , 72 , 85 , 99 , 36 , 65 , 49 , 84 , 73 , 54 , 43 , 44 , 23 , 33 , 43 , 53 , 63 , 73 , 83 , 93 , 44 , 55 , 65 , 74 , 89 , 77 , 60 Construct a grouped frequency distribution table with classes 20 – 30 , 30 – 40 , ……………………………… 90 – 100 .