90-99 9 22 22/9 100-109 9 15 15/9 Question no.8 Find the Relative frequencies for the frequency distribution given below: Out put in 50 - 59 60 -69 70 - 79 80 - 89 90 - 99 100 - 109 tons f 15 12 10 28 25 10 Relative Out put in tons f Frequency (F) 50-59 15 15/100=0.15 60-69 12 12/100=0.12 70-79 10 10/100=0.1 80-89 28 28/100=0.28 90-99 25 25/100=0.25 100-109 10 10/100=0.1 Total 100 …. Question no.9 Following is the group frequency distribution of 94 students which shows their test result in a class. Find the arithmetic mean. Class Interval No. Of Students 10-20 5 20-30 16 30-40 12 40-50 25 50-60 17 60-70 8 70-80 6 Class Interval f1 Class X1 fxi Boundry 10-20 5 9.5-20.5 (9.5+20.5)/2=15 75 20-30 16 19.5-30.5 25 400 30-40 12 29.5-40.5 35 420 40-50 25 39.5-50.5 45 1125 50-60 17 49.5-60.5 55 935 60-70 8 59.5-70.5 65 520 70-80 6 69.5-80.5 75 450
90-99 9 22 22/9 100-109 9 15 15/9 Question no.8 Find the Relative frequencies for the frequency distribution given below: Out put in tons 50 - 59 60 -69 70 - 79 80 - 89 90 - 99 100 - 109 f 15 12 10 28 25 10 Out put in tons f Relative Frequency (F) 50-59 15 15/100=0.15 60-69 12 12/100=0.12 70-79 10 10/100=0.1 80-89 28 28/100=0.28 90-99 25 25/100=0.25 100-109 10 10/100=0.1 Total 100 …. Question no.9 Following is the group frequency distribution of 94 students which shows their test result in a class. Find the arithmetic mean. Class Interval No. Of Students 10-20 5 20-30 16 30-40 12 40-50 25 50-60 17 60-70 8 70-80 6 Class Interval f1 Class Boundry X1 fxi 10-20 5 9.5-20.5 (9.5+20.5)/2=15 75 20-30 16 19.5-30.5 25 400 30-40 12 29.5-40.5 35 420 40-50 25 39.5-50.5 45 1125 50-60 17 49.5-60.5 55 935 60-70 8 59.5-70.5 65 520 70-80 6 69.5-80.5 75 450
Prcatice%20solution%2035-40.docx