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Mechanical pencil lead is manufactured with a mean width of 0.9 mm. Because of variability in...

Mechanical pencil lead is manufactured with a mean width of 0.9 mm. Because of variability
in the manufacturing process, the distribution of the width for pencil lead is approximately normal
with a standard deviation of 0.004 mm. If any pencil lead thinner than 0.8938 mm is discarded, what
proportion of pencil lead is NOT discarded? Round your answer to four decimal places.

With what functions on a TI-84 CE Plus calculator would you use to solve this?

math   Statistics-And-Probability   
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Answer #1

Let X denotes the width for pencil lead for a randomly selected pencil.

X ~ Normal(0.9, 0.0042) approximately

Now,

The probability that any randomly selected pencil lead will be thinner than 0.8938 mm

The Normal Probability Distribution menu for the TI-83+/84+ is found under  DISTR (2nd VARS).

DISTR -> 2:normalcdf

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