Solve this question please

There are about 17 million households in the US that self-identify as black and have annual income below $100 000. Aaron thinks the average annual family income for this population is about $40 000. Sophie thinks the actual average is probably less than Aaron's estimate. They agree to hypothesis test Aaron's estimate at level of significance 0.05, using the following annual income estimates from a random sample of twelve such families: 48500,56000,21000,21000,6500,36000,91000,56000,56000,61000,43500, 14000 The sample mean is The sample standard deviation is The value of the test statistic is The dof = The critical number is The P-value is