## Archive for the ‘2009 Maths’ Category

Thursday, November 19th, 2009

Tuesday, November 17th, 2009

Saturday, November 14th, 2009
Thanks to Sue Gilbert for pointing out that the correct solution to 2009 Q 27c is:
Mary has the better chance.
For Jane, Pr(wins at least one) = 1 – Pr(wins none) = 1 – (0.99)(0.99) = 0.0199.

Tuesday, November 10th, 2009

Monday, November 9th, 2009

Note: Thanks to aw for pointing out that in Q3cii, p = 1- 0.8985 = 0.1015, answer is 0.3483.

Friday, November 6th, 2009

Wednesday, November 4th, 2009

GM (see below) and David Phillips (Tintern Schools) pointed out that Business Module Q4c) The greater depreciation occurs with the reducing balance method. This greater amount of depreciation is 22000-10953.17=\$11046.83.
The question does NOT ask for the difference in the two methods.

Tuesday, November 3rd, 2009

Note: Thanks to John Howes, Matthew Flinders Girls’ Secondary College, for pointing out an error in Section 1 Multiple choice Q13. The time t seconds should read t minutes in the question, otherwise all the choices are incorrect.