IBTopper Posted September 19, 2016 Report Share Posted September 19, 2016 Hi, can someone please help me solve this problem? It is part of the HL Option Statistics and Probability Reply Link to post Share on other sites More sharing options...
kw0573 Posted September 25, 2016 Report Share Posted September 25, 2016 On 9/19/2016 at 11:24 AM, IBTopper said: Hi, can someone please help me solve this problem? It is part of the HL Option Statistics and Probability Take my answer with a grain of salt since I didn't learn the option, but simply found the textbook this was in and read some previous pages. Formula Var (sample mean) = Var(population) / sample size n. Then EQUATION A) σ (sample mean) = σ (population) / sqrt(n), n = 2 Given: B) σ(sample mean) = σ(population) - 20 Substitute B) into A), σ(population) - 20 = σ(population) / sqrt(2) σ(population) (1 - 1/sqrt(2)) = 20 σ(population) = 20/(1 - 1/sqrt(2)) = 68.3 Reply Link to post Share on other sites More sharing options...
IBTopper Posted September 27, 2016 Author Report Share Posted September 27, 2016 Hi, Yes indeed that's the answer!! Thank you so much Your help was greatly appreciated. PS: I really like your saying "Learning is a big part of life, but marks are not" Thanks so much Reply Link to post Share on other sites More sharing options...
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