statistics questions asap

Project Description:

(a) abc manufacturing company finds 10% defective items in their production output. the quality system manager has been instructed by the top management of the company to analyse and recommend solutions for improving the process. if a sample of 20 items is inspected, what is the probability of finding exactly two or three defectives?


(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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