Thank you!

1.

a)

write short notes on mean absolute deviation

b)

The following date relates to the sales date of an engineering firm;

Profits (Sh. "Million")

Quarter Year 1 2 3 2003 5.5 5.4 7.2 6.0 2004 4.8 5.6 63 5.6 2005 40 6.3 7.0 6.5 2006 5.2 6.5 7.5 7.2 2007 60 7.0 R4 7.7 Required: The desemonalised sales of the engineering firm ii) Trend line using the least square method