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The first non-zero digit of the Avogadro constant has to be chosen from the digits 1 to 9. It is required to find the probability of choosing the correct digit (6).

Probability is a number between 0 and 1 that indicates whether a particular event will occur out of all the possible results.

It is calculated using the formula

$P\left(E\right)=\frac{\text{Number}\text{of}\text{favourable}\text{outcomes}}{\text{Total}\text{number}\text{of}\text{outcomes}}$

Let F be the event of choosing the first non-zero digit for Avogadro constant as 6.

Here, the total number of digits that can be chosen for the first non-zero digit is 9.

The number of correct digits is 1.

The probability of choosing the correct digit of 6 is

$$\begin{gathered} P\left(F\right)=\frac{\text{Number}\text{of}\text{correct}\text{digit}\left(\text{s}\right)}{\text{Total}鈥�\text{number}\text{of}\text{digits}} \\ =\frac{1}{9} \\ =0.11 \end{gathered}$$

Therefore, the probability that the answer is correct (6) is 0.11.