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Write down the process of collecting Primary Data.
Determine First Quartile (Qā), 7th Decile (Dā), and 80th Percentile (Pāā) from the following data:
| Age in years | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 |
| No of people | 2 | 11 | 24 | 35 | 27 | 17 | 11 | 8 | 5 |
Calculate the correlation coefficient between income and expenditure in foods of certain families of Kathmandu Metropolitan from the following information:
| Incone (000 rs) | 10 | 11 | 12 | 13 | 14 |
| Expenditure in food (000 rs) | 9 | 8 | 9 | 12 | 11 |
What is sampling? The standard deviation of marks in an entrance exam for BCA students is 0.5. How large a sample must be taken in order to be 95% confident that the error of his/her estimate will not exceed 0.01?
Calculate the median and mode from the following distribution:
| Expenditure (000 rs) | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| Number of families | 7 | 12 | 15 | 13 | 8 | 5 |
A test was given to three candidates taken at random from three provinces of Nepal. The scores of candidates are given below:
| Proviences | Scores | ||
| Gandaki | 9 | 7 | 6 |
| Lumbini | 7 | 4 | 5 |
| Bagmati | 6 | 5 | 6 |
A box contains 50 items of which 20 are defective. If one item is selected randomly from the box, what is the probability that it is a non-defective item?
Attempt any TWO questions
[2x10=20]From the following data, determine the average marks of students, standard deviation, and coefficient of variation:
| Marks | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 |
| No. of peoples | 54 | 90 | 86 | 58 | 62 | 82 | 78 | 66 | 70 |
In a normal distribution with mean = 200 and standard deviation = 20, find the probability that:
i) š(š > 180)
ii) š(š < 220)
iii) š(160 < š < 240)
iv) š(š > 220)
v) 10% values are less than what value of š?
Describe Simple Random Sampling with a suitable example.