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Finding the best score

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The Jackson triplets, Jenny, John, and James, are in different algebra classes at City High. On their final exams, Jenny scored 85 on a test with a mean of 78 and a standard deviation of 8.5; John scored 78 on a test with a mean of 73 and a standard deviation of 9; and James scored 83 on a test with a mean of 75 and a standard deviation of 8. Who had the best score?

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The solution depicts the steps to find out best relative score.

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Z score of Jenny=(test score-mean)/standard ...

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• BEng (Hons) , Birla Institute of Technology and Science, India
• MSc (Hons) , Birla Institute of Technology and Science, India
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