(c)It is observed that the average scores on a science test are normally distributed with a mean of

(c)It is observed that the average scores on a science test are normally distributed with a mean of 500 and a standard deviation of 80. The scores may have fractional parts.

(i) What proportion of the scores is between 400 and 600?1 mark

(ii) What value do the upper 10% of the scores exceed?

 
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