SOLUTION: Suppose a test of coordination for first graders is scored so that the mean for all first graders is 50 and the standard deviation is 15. If we assume further that the distribution
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Question 1009752: Suppose a test of coordination for first graders is scored so that the mean for all first graders is 50 and the standard deviation is 15. If we assume further that the distribution is normal, what percent of the first graders score: A. Between 40 and 70?. B. Below 30 ?. C. Above 75? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mu)/sigma
the first is z between -2/3 and +4/3, which is 0.6563
The second is z < -4/3, and this is 0.0912
The third is z>(5/3) and this is 0.0478.
