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):}`

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):}

Calculate the mode from the following data : {:("Class Interval",20-24,25-29,30-34,35-39,40-44,45-49,50-54,55-59),("Frequency"," "3," "5," "10," " 20," "12," "6," "3," "1):}

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 arithmetic mean of the following frequency distribution: {:("Class","less than 10",10-20,20-30,30-40,40-50,50-60,"more than 60"),("Frequency"," "5," "12," "18," "22," "6," "4," "3):}

Calculate mode of the following sercies : {:("Class Interval",0-5,5-10,10-15,15-20,20-25,25-30,30-35),("Frequency"," "1," "2," "10," "4," "10," "9," "2):}

Calculate the median from the following data - set : {:("Size",10-15,15-17.5,17.5-20,20-30,30-35,35-40,40-50),("Frequency"," "10," "15," "17," "25," "28," "30," "40):}

Calculate mean , median and mode from the following data : {:("Class Interval",30-40,40-50,50-60,60-70,70-80,80-90),("Frequency"," "18," "37," "45," "27," "15," "8):}

Calculate median of the following of data : {:("Class Interval",0-5,5-10,10-20,20-30,30-50,50-70,70-100),("Number of Students"," "12," "15," "25," "40," "42," "14," "8):}