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April 20, 2014

Homework Help: statistics

Posted by Shanae on Saturday, June 15, 2013 at 5:55pm.

It is known that for a certain firm specializing in manufacturing female T-shirts, the ‘Small’ sizes have a shoulder size of 14 inches or less. If these T-shirt shoulder sizes are normally distributed with a mean of 16 inches and a standard deviation of 2 inches
(i)What proportion of manufactured T-shirt sizes will be ‘Small’?
(ii) In a random sample of 40 T-shirts manufactured by this firm, what is the probability that none will be ‘Small’?
(iii) What size of T-shirt will be greater than 80% of all the sizes produced?

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