(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?