Question

On the packaging, #10 screws are listed as being 0.190" in diameter. Using your caliper, you find that the diameters of 3 screws are 0.193", 0.192" and 0.189".
What is the average diameter of these screws?

Answer 1

Adding the values and dividing by the number of values, it is found that the average diameter of these screws is of 0.1913''.

The mean of data-set is the sum of all observations divided by the number of observations.

In this problem:

• There are 3 observations.
• They are: 0.193", 0.192" and 0.189".

Hence, the average diameter is given by:

$M = \frac{0.193 + 0.192 + 0.189}{3} = 0.1913$

The average diameter of these screws is of 0.1913''.

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