The width of bolts of fabric is normally distributed with mean 950 mm (millimeters) and standard deviation 10 mm. a) What is the probability that a randomly chosen bolt has a width of between 947 and 958  mm? b) What is the appropriate value for C such that a randomly chosen bolt has a width less than C with probability .8531?

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The width of bolts of fabric is normally distributed with mean 950 mm (millimeters) and
standard deviation 10 mm.
a) What is the probability that a randomly chosen bolt has a width of between 947 and 958 
mm?
b) What is the appropriate value for C such that a randomly chosen bolt has a width less than
C with probability .8531?

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