["Height (in cm.)",:,95-105,105-115,115-125,125-135,135-145],["Number of boys",9,13,26,30,12]

Find the mean deviation about the mean for the data : Height 95-105 105-115 115-125 125-135 135-145 145-155in cms Number of Boys 9 13 26 30 12 10

Find the mean height of 65 boys from the following data : {:("Height (in cm)",142,144,146,148,150,152),("Number of boys",10,13,12,7,17,6):}

Find the 20^(th) percentile of the following data : {:("Height (in cm)",135,140,145,150,155,160,165,170),("No. of students",7,20,32,48,36,28,24,4):}

If the arithmetic mean of the following series is 115.86, find the missing value. {:("Wages(Rs.)",110,112,113,117,?,125,128,130),("Number of Workers",25,17,13,15,14,8,6,2):}

The following frequency distribution gives the monthly consumption of electricity of 68 consumers of a locality . Find the mean of the data {:("Monthly consumption(in units)","Number of consumers"),(65-85,4),(85-105,5),(105-125,13),(125-145,20),(145-165,14),(165-185,8),(185-205,4):}

The following frequency distribution gives the monthly consumption of electricity of 68 consumers of a locality. Find the median, mean and mode of the data and compare them. Monthly consump- 65-85 85-105 105-125 125-145 145-165 165-185 185-205 No. of consumers: 4 5 13 20 14 8 4

Find the range of the series : (i)75,85,95,105,115,125 (ii)15,18,13,16,14,13,14,19,21

Following is the distribution of I.Q. of 100 students. Find the median I.Q. I.Q. 55-64 65-74 75-84 85-94 95-104 105-114 115-124 125-134 135-144 No. of Students: 1 2 9 22 33 22 8 2 1

Following is the distribution of I.Q. of 100 students. Find the median I.Q. I.Q.: 55-64 65-74 75-84 85-94 95-104 105-114 115-124 125-134 135-144 No. of Students: 1 2 9 22 33 22 8 2 1