I need help with first Q only 

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Q2. The following are the grades which 40 students obtained in a certain course in 1997E.C. here in Mekelle University of the Arid Campus.

 

75  89  66  52  90  68  83  94  77  60 38  47  87  65  97  49  65  72  73  81  63  77  31  88  74  37  85  76  74  63  69  72  91  87  76  58  63  70  72  65

 

 

 

 

 

 

 

      a. Construct an absolute frequency distribution.

b. Convert the distribution obtained in (a) into a Relative & Percentage distribution.

c. Convert the distribution in (a) into a “Less than” &

     a “More than” cumulative distribution

d. Construct a histogram, frequency polygon and ogive curve

 

 

 

 

 

 

 

Q3. The following distribution shows that the result obtained by 100 accounting students in the final examination of statistics in Saudi Electronic University. 

 

Mark of students.

0-10

10-20

20-30

30-40

40-50

No. of students

14

f1

28

f2

15

        

If the median mark of students is 22.5, compute:-

                                                                                         i.      The missing frequencies, f1 and f2.

                                                                                       ii.      the mode, and

                                                                                     iii.      the arithmetic mean

                                                                                     iv.      variance

 

 

    • 11 years ago
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