Edexcel Mathematics Higher Tier, November 2009 (1380/4H) (Paper 4, calculator)


Question 24


We must scale the data down so that we have a total of only 50 instead of 382. We therefore multiply the data by 


We are only interested in the girls in year 13 so we scale down this category .


85 x   = 11.1 girls. Obviously we can’t have 11.1 girls in our sample so we round this figure to 11.


Question 25 This means that we can write the equation


y   this can be rewritten as


y = kx where k is a constant (to be found)


a) we know that x = 500 when y = 10 so we have 10 = k x 500 rewrite k x 500 = 10 divide both sides by 500 k = 0.02


So y = 0.02x b) y = 0.02 x 350 = 7


www.chattertontuition.co.uk


0775 950 1629


Page 11


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15