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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?
 one year ago
 one year 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?
 one year ago
 one year ago

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ashnaBest ResponseYou've already chosen the best response.3
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? z(85) = (85100)/15 = 15/15 = 1 That means 85 is one standard deviation to the left of the mean.
 one year ago

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

ashnaBest ResponseYou've already chosen the best response.3
And 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 ?
 one year ago

bradley0516Best ResponseYou've already chosen the best response.0
yes I understand now thanks ashna
 one year ago
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