Concerns about climate change and co2 reduction have initiated the commercial production of blends of biodiesel (e. g., from renewable sources) and petrodiesel (from fossil fuel). random blended fuel samples of size 35 are tested in a lab to ascertain the bio/total carbon ratio (x). if the true (i. e. population) mean is 0.948 and the true (i. e. population) standard deviation is 0.006, what is the distribution of xbar?