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chrisfandypada
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If 500 pupils' scores that were gathered follow a normal distribution: 16 Aug 2021, 04:30
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If 500 pupils' scores that were gathered are within a normal distribution, and that the mean is 70, the variance is 16, and the standard deviation is 4:
1) At random, a pupil was chosen. What is the probability that his score will be higher than 65?
2) How many pupils received a score below 60?
3) What is the score that is minimum for a pupil to have obtained an award, if the top 5% of students win awards for their high grades?

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