Solutions to Unit 1 - The Burns Home Page

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c) PCnTn S320d) P F 1P FnF1nS71 201320 8.SHAC14 16 812The number combined in both sets is 50-12=38Let HA represent Head aches only, B represent both, and C represent coldsTherefore HA+B=30C+B=24HA+B+C=38We have three equations and three variables, therefore we can do this.Rewrite the first two equations in terms of BHA=30-BC=24-BPlug these into the third equation.(30-B)+B+(24-B)=3854-B=38B=16
Therefore HA 30 1614C 24 16 8b i) 14 students have just a headacheP HA1450725n HAn Sb ii) 14+8+16=38 have headache or coldP HA or Cn HA or CnS38501925b iii) 12+14=26 have no cold symptomPnone26501325n nonen S10. Let A represent the event of drawing an aceLet B represent the event of drawing a club
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Solutions to Unit 1 - The Burns Home Page

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