निम्नलिखित बंटन के लिए माध्य , प्रसरण तथा मानक विचलन ज्ञात कीजिए :
`{:("वर्ग",30-40,40-50,50-60,60-70,70-80,80-90,90-100),("बारम्बारता"," "3," "7," "12," "15," "8," "3," "2):}`

Calculate mode from the following data : {:("Class Interval",30-40,40-50,50-60,60-70,70-80,80-90,90-100),("Frequency"," "3," "4," "6," "10," "6," "4," "3):}

Caculate mode of the following data : {:("Marks",0-5,5-10,10-20,20-40,40-60,60-80,80-90,90-100),("Number of Students"," "5," "7," "9," "25" "," "30," "24," "8," "6):}

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):}

Construct a frequency polygon for the following distribution, using a graph sheet : {:("Marks",30-40,40-50,50-60,60-70,70-80,80-90),("No. of students"," "6," "15," "28," "34," "18," "8):}

Find the cumulative frequency of the class 40-50 in the following distribution. {:("Class ",40-50,50-60,60-70,70-80,80-90,90-100),("Frequency "," "10," "25," "28," "12," "10," "15):}

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):}

Find the first decile for the following data: {:("Size", 0.10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Frequency "," "2," "18," "30, " "45, " "35, " "20, " "6, " "3):}

The CAT scores of 60 students are summarized below: {:("Class ",40-50,50-60,60-70,70-80,80-90,90-100),("Frequency"," "10," "8," "12," "15," "10,"5):} Calculate the sample mean,the sample variance and the standard deviation for the grouped data