Posted by **carly** on Wednesday, November 21, 2012 at 2:52pm.

if a test has a mean of 150 and a standard deviation of 30, we know that:

a)50% of the respondents scored between 180 and 210

b)68% of the responents scored above 120

c)50% of the respondents scored between 120 and 210

d) 96% of the respondents scored between 90 and 210

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