An elementary school dass ran one mile with a mean of 11 minutes and a standard

Question

An elementary school dass ran one mile with a mean of 11 minutes and a standard deviation of three minutes. Rachel, a student in the class, ran one mile in eight minutes. A junior high school class ran one mile with a mean of nine minutes and a standard deviation of two minutes. Kenji, a student in the class, ran 1 mile in 7.5 minutes. A high school class ran one mile with a mean of seven minutes and a standard deviation of four minutes. Nedda, a student in the class, ran one mile in nine minutes. (a) Why is Kenji considered a better runner than Nedda, even though Nedda ran faster than he? (Round your standard deviations to two decimal places.) standard deviations Selec than the mean of his class and Kenji is considered a better runner than Nedda because Kenji's time for one mile was Nedda's time was standard deviationsSelect than her class (b) Who is the fastest runner with respect to his or her class? Explain why. (Round your standard deviation to two decimal places.) Select was the fastest runner with respect to his/her class as he/she had a time that was standard deviation() faster than his/her class

Explanation / Answer

Solution:-

Solution:-
a) Rachel : (8 - 11)/3 = -1

kenji : (7.5 - 9)/2 = -0.75

nedda : (9 - 7)/4 = 0.5

=> hence, 0.5 > -1.
nedda is better runner than kenji

b) Rachel run fastr in class. she had a time that was exaclty one standard deviation faster as compare to her class

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