I need help finding the bull hypothesis and solving for z

7. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm. Assuming the population standard deviation is known to be 1.6 cm, use a 0.05 significance level to test the claim that the mean circumference of all pumpkins is equal to 39.9 cm Z = X - M n