X-N (45, SIGMA) P(W<54)=0.75 SO 54-45/SIGMA = 0.67 I don't understand where the 0.67 has come from, it's not in any of the tables what happened to the 0.75, why is it 0.67 This came up in a paper before but I didn't understand it :'( This question was from June 2007 Edexcel S1 Q2e Please help me someone, my exam is tomorrow! Thanks
X-N (45, SIGMA) P(W<54)=0.75 SO 54-45/SIGMA = 0.67 I don't understand where the 0.67 has come from, it's not in any of the tables what happened to the 0.75, why is it 0.67 This came up in a paper before but I didn't understand it :'( This question was from June 2007 Edexcel S1 Q2e Please help me someone, my exam is tomorrow! Thanks