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Can you answer the following showing workings out and formula used. The length of a screw...

Can you answer the following showing workings out and formula used.

The length of a screw manufactured by a company is normally distributed with mean 2.5cm and a standard deviation 0.1cm. Specifications call for the lengths to range from 2.4cm to 2.6 cm.

a, What proportion of parts will be greater than 2.65cm?

b, What length is exceeded by 10% of the parts?

c, What percentage of parts will not meet the specification?

d, If you randomly pick three of those items, what would be the probability that exactly two of them will meet the specification?

math   Statistics-And-Probability   
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