According to a University Center for Logistics Management, 9% of all merchandise sold in the United States gets returned. A Seattle department store sampled 90 items sold in January and found that 10 of the items were returned.

If you have the following null and alternative hypotheses for a test you are running:

$\displaystyle {H}_{{0}}:{p}={0.09}$
$\displaystyle {H}_{{a}}:{p}<{0.09}$

Calculate the test statistic, rounded to 3 decimal places