Assignment Task:

Question:

A manufacturer of compact discs decides to take a random sample of the discs and measure the diameter. The diameter of the discs is a critical measurement, since if the discs are too large they will not fit in the players and if they are too small then they will not be read properly. The sample of 30 discs yields the following data (in.):

 

4.47, 4.72, 4.76, 4.72, 4.73, 4.72, 4.76, 4.74, 4.75, 4.75

4.76, 4.72, 4.73, 4.72, 4.47, 4.72, 4.76, 4.72, 4.76, 4.74

4.76, 4.72, 4.73, 4.72, 4.76, 4.74, 4.47, 4.72, 4.76, 4.72

 

  1. Find the mean diameter of the compact discs.

  2. Find the median diameter of the compact discs.

  3. Find the standard deviation of the compact discs.




 

Question: Lillian Tyson has been the chairperson of the county library     committee for 10 year. She contends that during her tenure she has managed the book mobile repair budget better than her predecessor did. Here are data for bookmobile repair for 15 years:

 

Year   

Town budget

Year   

Town budget

Year   

Town budget

1992

30000

1987

24000

1982

30000

1991

28000

1986

19000

1981

20000

1990

25000

1985

21000

1980

15000

1989

27000

1984

22000

1979

10000

1988

26000

1983

24000

1978

9000

 

  1. Calculate the average and Coefficient of Variation of annual budget for the last 5 years (1988-1992).

  2. Calculate the average and Coefficient of Variation of annual budget for the first 5 years in office (1983-1987).

  3. Calculate the average and Coefficient of Variation of annual budget for the 5 years before she was elected (1978-1982).

 

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  • Posted on : October 16th, 2018

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