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Business Statistics Question Paper

Business Statistics 

Course:Bachelor Of Commerce In Business Studies

Institution: Kenyatta University question papers

Exam Year:2012



KENYATTA UNIVERSITY
SCHOOL OF BUSINESS
DEPARTMENT OF MANAGEMENT SCIENCE
BMS 200: BUSINESS STATISTICS
Cat one
a) Explain two uses of statistics (2 marks)

b) Differentiate between ordinal and nominal variables (4 marks)

c) A distribution is such that ?_(t=1)^10¦?x_i=100? and ?_(i=1)^10¦x_i^2 =1360

i)Find the mean and standard deviation of the distribution (4 marks)

ii) It was discovered that one element measuring 21 was erroneously left
out. Determine the new mean and standard deviation (4 marks)

d) The following marks belong to 29 students of a secondary school in Keroka municipality
Marks Number of students
0-10 10
10-20 ?
20-30 25
30-40 30
40-50 ?
50-60 10
On later analysis it was discovered that two class interval frequencies were missing.The median score was found to be 30.
Required
i) Find the missing frequencies
ii) Determine the modal mark of the students
iii) Find the mean mark
iv)Find the standard deviation (10 marks)

The students are categorized in ascending earnings as follows

Grade A-upper 25% of the students
Grade B-middle 45%of the students
Grade C -lower 30%of the students
Find the cut off salary for each category (6 marks)




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