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Sir, can you help me with this taks?The results of an accountancy exam are normally distributed with a mean score of 58 and a standard deviation of 10.What is the percentage probability that a student will score more than 80 (to 2 decimal places)?
The answer is 1.39%, but i cant reach to it. My result is 0.4861 or 48.61%
Thanks,You have calculated the probability of the score being between 80 and the mean of 58.
However the question asks for the probability of the score being more than 80.
The probability of being more than 58 is 50% (because it is symmetrical) and so if the probability of being between 58 and 80 is 48.61%, then the probability of being more than 80 is 50% – 48.61% = 1.39%Have you watched my free lectures on this? The lectures are a complete free course for Paper MA and cover everything needed to be able to pass the exam well.
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