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bradley0516
 3 years ago
A set of data is normally distributed with a mean of 100 and standard deviation of 15.
· What would be the standard score for a score of 85?
· What percentage of scores is between 100 and 85?
· What would be the percentile rank for a score of 85?
bradley0516
 3 years ago
A set of data is normally distributed with a mean of 100 and standard deviation of 15. · What would be the standard score for a score of 85? · What percentage of scores is between 100 and 85? · What would be the percentile rank for a score of 85?

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ashna
 3 years ago
Best ResponseYou've already chosen the best response.3A set of data is normally distributed with a mean of 100 and standard deviation of 15. What would be the standard score for a score of 85? z(85) = (85100)/15 = 15/15 = 1 That means 85 is one standard deviation to the left of the mean.

ashna
 3 years ago
Best ResponseYou've already chosen the best response.3Now one standard deviation from the mean covers 34% of the population. normal (85,100,100,15) = 0.3413

ashna
 3 years ago
Best ResponseYou've already chosen the best response.3And the lat one , the tail to the left of 85 must have 0.50000.3413 = 0.1587 of te population. The percentile score must be 15.87% . got it ?

bradley0516
 3 years ago
Best ResponseYou've already chosen the best response.0yes I understand now thanks ashna
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