Calculate the median value , given the following statistical information :
`{:("Age",20-25,25-30,30-35,35-40,40-45,45-50,50-55,55-60),("Number of Students"," "50," "70," "100," "180," "150," "120," "70," "60):}`

Given the following data , find out median : {:("Age",20-25,25-30,30-35,35-40,40-45,45-50,50-55,55-60),("Number of Students"," "50," "70," "100," "180," "150," "120," "70," "60):}

Calculate the mean marks from the following data: {:("Marks",20-25,25-30,30-35,35-40,40-45,45-50,50-55),("No. of Students"," "10," "12," "8," "20," "11," "4," "5):}

Determine median value of the following series using graphic method : {:("Marks",0-5,5-10,10-15,15-20,20-25,25-30,30-35,35-40),("Number of students"," "4," "6," "10," "10," "22," "25," "18," "5):}

Calculate the median from the following series : {:("Age (Years)",55-60,50-55,45-50,40-45,35-40,30-35,25-30,20-25),("Number of Students"," " 7," "13," "10," "15," "30," "33," "28," "14):}

50 students of economics , secured the following marks in an examination : {:("Marks",20-25,25-30,30-35,35-40,40-45,45-50,50-55,55-60,60-65,65-70),("Students"," "6," "3," "7," "4," "6," "4," "2," "8," "3," "7):} Caculate median.

Caculate the median and mode from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Students"," "2," "18," "30," "45," "35," "20," "6," "3):}

Calculate arithmetic mean from the following data by Short-cut Method: {:("Class Interval",20-25,25-30,30-35,35-40,40-45,45-50,50-55),("Frequency"," "10," "12," "8," "20," "11," "4," "5):}

Obtain the mean , median and mode of the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Students"," "5," "7," "15," "25," "20," "15," "8," "5):}