Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. What is the percentage of scores between 80 and 140?
1 Answer
Explanation:
We know that the standard deviation is
#34%# fall between#80# and#100# #34%# fall between#100# and#120# #13.5%# fall between#120# and#140#
Therefore,
#34% + 34% + 13.5% = 81.5% #