Step 1 :The null hypothesis is the statement that the proportion of yellow peas is equal to 0.27, which is the claim we are testing. The alternative hypothesis is the statement that the proportion of yellow peas is not equal to 0.27. This is because we are testing the claim that the proportion is 0.27, not that it is not 0.27 or greater than 0.27. Therefore, the null and alternative hypotheses are: \(H_{0}: P=0.27\) and \(H_{1}: p \neq 0.27\). So, the answer is A.
Step 2 :Final Answer: \(\boxed{\begin{array}{l} H_{0}: P=0.27 \\ H_{1}: p \neq 0.27 \end{array}}\)