1. Weekly overtime hours by 15 randomly selected custodial sta' at State College for the last week of August was: 01520212325283036373740455073 a) The average overtime hours worked for a custodial person. (3 marks) b) The median of the overtime hours worked. (3 marks) c) The standard deviation of the overtime hours worked. (4 marks) (1) Based on the results of a and b comment on which measurement you feel would be most useful for measuring central tendency for the custodial staff at State College. (3 marks) 3. The following table presents monthly seasonal indexes for the cost of a bushel of grapefruits in a certain county in Florida. January February March April May June 0.90 0.87 0.95 0.93 1.00 1.04 July August September October November December 1.05 1.10 1.12 1.02 1.03 0.99 a) Interpret the seasonal index for September. (2 marks) b) From the original historical data (1999 - 2003) a trend line of TRt = $5.50 + $0.23t, where t = 1 to 60, was calculated. Assuming a multiplicative seasonal model forecast the cost of a bushel of grapefruits for each of the first six months of 2004. (6 marks)