Assuming a bell- shaped distribution, what percentage of scores exceeded 190?`

Mathematics
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A study was designed to investigate the effects of two variables- (1) a student's level of mathematical anxiety and (2) teaching method- on a students achievement in a math course. Students who had a low level of math anxiety were taught using the traditional expository method. These students obtained a mean score of 270 with standard deviation of 40 on standard test. Assuming bell-shaped distribution, what percentage of scores exceeded 190?

Apr 29th, 2015


P(x>190)=P(z>(190-270)/40)= P(z>-2)=1-P(z< 2)= 1- .97725=.02275 or 2.28%





























Apr 29th, 2015

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Apr 29th, 2015
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Apr 29th, 2015
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