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stressedadfff

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hey guys does anyone know whether for c is just bi -bii as the answers say otherwiseScreen Shot 2021-07-20 at 11.06.33 pm.png
 

notme123

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If you mean the z-scores of 3.9-3.5, no this is the z-score difference which doesn't really have any significance. We want to find the probability between these z-scores which we do use the probability table. Here, the z-scores are 2.26 and 0.97 respectively. Hence we need to find P(2.26)-P(0.97) Using the table, you simply find the corresponding area value of 2.26 (from the table) and subtract the area value of 0.97 (again from the table).
 

stressedadfff

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If you mean the z-scores of 3.9-3.5, no this is the z-score difference which doesn't really have any significance. We want to find the probability between these z-scores which we do use the probability table. Here, the z-scores are 2.26 and 0.97 respectively. Hence we need to find P(2.26)-P(0.97) Using the table, you simply find the corresponding area value of 2.26 (from the table) and subtract the area value of 0.97 (again from the table).
yess thats what i did ut the answers were different, must be a mistake...
 

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