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

Z = X-mue / sigma.             Where mue = mean,  sigma = stud .dev.

  = 190 -270/ 40

  = -2

Probability Z> 190 is equal to.  1- probe. Z < 190.

 =. 1- 0.0228

= 0.9772

Apr 29th, 2015

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Apr 29th, 2015
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Apr 29th, 2015
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