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Answer all Questions.

Find the range, the semi-interquartile range and the standard deviation of the following distribution:

 

Weekly hours

No. of Workers

50-54

4

45-49

12

40-44

15

35-39

13

30-34

6

                                                                                     N = 50

 

2.

On two final examinations (Anatomy and Pathophysiology), the class’ mean grade was 76 and the standard deviation was 7.6. A Nursing student scored 71 in Anatomy and 75 in Pathophysiology. In which examination was the student’s standing higher? 

 

 

3.A master’s student received a grade of 84 on a final examination in Research for which the class mean grade is 76 and the standard deviation is 10. On the final examination for the Statistics for which the classes mean grade was 82 and the standard deviation is 8, the master student received grade of 92. In which subject was the student’s standing higher?