The following table shows monthly pocket expenses of the students of a class. Find out average pocket expenses.
`{:("Pocket Expenses(Rs.)",20-29,30-39,40-49,50-59,60-69),("Number of Students"," "10," "8," "6," "4," "2):}`

The following table shows marks obtained by the students of a class in their test in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculate arithmetic mean using Step-deviation method.

The following table shows marks secured by the students of a class in an examination in English: {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):} Calculte mean marks using Short-cut Method.

The following table shows wages of the workers. Calculate the average wage of the workers. {:("Wages(Rs.)",10-19,20-29,30-39,40-49,50-59),("Number of Workers"," "8," "9," "12," "11," "6):}

Find out median marks from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "8," "30," "40," "12," "10):}

The distribution below gives the weights of 30 students of a class. Find the median weight of the students : {:("Weight (in kg) ",40-45,45-50,50-55,55-60,60-65,65-70,70-75),("Number of students "," "2," "3," "8," "6," "6," "3," "2):}

Caculate mode of the following distribution : {:("Marks",10-19,20-29,30-39,40-49,50-59,60-69,70-79,80-89,90-99),("Number of Students"," "29," "87," "181," "247," "263," "133," "40," "9," "2):}

Calculate mode of the following sercies: {:("Class Interval",10-19,20-29,30-39,40-49,50-59,60-69,70-79),("Frequency"," "10," "12," "18," "30," "16," "6," "8):}