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Unformatted text preview: ..................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (Total 6 marks) 525 769. A sum of \$ 5 000 is invested at a compound interest rate of 6.3 % per annum. (a) Write down an expression for the value of the investment after n full years. (b) What will be the value of the investment at the end of five years? (c) The value of the investment will exceed \$ 10 000 after n full years. (i) Write an inequality to represent this information. (ii) Calculate the minimum value of n. ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (Total 6 marks) 526 770. The speeds of cars at a certain point on a straight road are normally distributed with mean µ and standard deviation σ. 15 % of the cars travelled at speeds greater than 90 km h–1 and 12 % of them at speeds less than 40 km h–1. Find µ and σ. ............................................................................................................................................... .............................................................................................................................................
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## This note was uploaded on 06/24/2013 for the course HISTORY exam taught by Professor Apple during the Fall '13 term at Berlin Brothersvalley Shs.

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