Question 1 According to the information given in Table:

Age (x), years. Number of employees (f), pers. Interval centres (x')

25-30. 20. 27.5

30-35. 80. 32.5

35-40. 100. 37.5

40-45. 40. 42.5

45-50. 10. 47.5

Total. 250. x

Calculate the dispersion (use 1 "." separated decimal unit, e.g. 5.5)

Answer:

Question 2

According to the information given in Table:

Age (x), years Number of employees (f), pers.Interval centres (x')

20-25 10 22.5

25-30 110 27.5

30-35 70 32.5

35-40 50 37.5

40-45 10 42.5

Total 250 x

Calculate the median of the age (use 1 "." separated decimal unit, e.g. 5.5)

Answer:

Question 3

According to the information given in Table:

Age (x), years Number of employees (f), pers.Interval centres (x')

30-35 10 32.5

35-40 80 37.5

40-45 100 42.5

45-50 50 47.5

50-55 10 52.5

Total 250 x

Calculate the relative linear deviation (use 1 "." separated decimal unit, e.g. 5.5)

Answer:

Question 4

According to the information given in Table:

Gender Average age, years Number of employees Group dispersion

i ni Si2

Men 37 255 195

Women 44 295 265

Total - 550

Calculate the internal group dispersion (use 1 "." separated decimal unit, e.g. 5.5)

Answer:

Question 5

According to the information given in Table:

GenderAverage age, years Number of employees Group dispersion

i ni Si2

Men 38.5 245 205

Women 43.3 305 255

Total - 550

Calculate the empirical determination coefficient (use 1 "." separated decimal unit, e.g. 5.5)

Answer: