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The length of a manufactured machine part is normally distributed with mean 12cm and a standard deviation 0.2cm. Specifications call for the lengths to range from 11.6cm to 12.2cm
a) What proportion of parts will be smaller than 11.7cm? (3 marks)
b) What length is exceeded by 25% of the parts? (4 marks)
c) What proportion of parts will meet the specification? (4 marks)
d) What value of the standard deviation is required so that less than 7% of parts have a length
greater than 12.2cm?
Student is looking for a Math Tutor who can help on an ongoing basis
Added: Friday 5th of June 2020