Question

Asked Oct 21, 2019

Step 1

a)

The proportion of rods has a length less than 19.9 cm is ** 0.0764** and it is calculated below:

Let us define the random variable *X* as the lengths of the rods follows a normal distribution with a mean of 20 and a standard deviation of 0.07.

Step 2

b)

The proportion of rods will be discarded is **0.0150** and it is calculated below:

From the given information, the rods will be discarded if length shorter than 19.8...

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