Tribhuvan University
Bachelor of Business Administration
Semester 3 · TU Board 2022
Course Title: Business Statistics (STT201)
Full Marks: 36Pass Marks: 18Time: 2 hrs
Candidates are required to give their answers in their own words as for as practicable.
Group A
Brief Answer Questions(4 × 2 = 8)
- 1.2
Consider the following set of sample data: 781211438811010762122130957813989125 Calculate the lower and upper quartiles.
- 2.2
If the coefficient of skewness is 0.5, first quartile is 8 and third quartile is 16, find the median of the distribution.
- 3.2
A bag contains 20 balls numbered from 1 to 20. A ball is selected at random without replacement, what is the probability of (a) multiple of 3 or 7 (b) multiple of 3 or 4?
- 4.2
A random variable x has the following probability distribution. X01234P(x)0.220.180.350.150.10 Compute the expected value and variance.
Group B
Short Answer Questions(4 × 3 = 12)
- 5.3
Compute the five number summaries from the following data and comment on the shape of the distribution: 71125231934293191530
Answer comingAlso asked in 2026
- 6.3
Find the mean and standard deviation from the following data related to age distribution of a class. Age (yrs)151617181920No of students57121574
- 7.3
The mean height and variance of height of 500 students were found to be 165 cm and 25 cm² respectively. Find the range of height of middle 80% of the students.
- 8.3
A sample of heights of 6400 Indian has a mean of 67.85 inches with a standard deviation of 2.56 inches, while sample of heights of 1600 British has a mean of 68.55 inches with a standard deviation of 2.52 inches. Do the data indicate that British are on the average taller than Indians at 5% level of significance?
Group C
Comprehensive Answer Questions(2 × 8 = 16)
- 9.8
The following table shows the monthly expenditure of people living in village A and village B of a country. Expenditure (000 Rs)51015202530No. of families in village A4145120104No. of families in village B8184018129 Which village people have uniform expenditure on the basis of coefficient of variation?
- 10.8
A random sample of 12 records revealed the following information concerning the number of machines serviced and the time (in minutes) to complete the routine service call: No. of machines1189107684105512Service time (minutes)11560809055657033955040110 a) Calculate coefficient of correlation and interpret. b) Estimate the regression equation. If there are six machines, how many minutes should expect a routine service call to require?
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