Return to question 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 samples of 41 blended fuels are tested in a lab to ascertain the bio/total carbon ratio. 5 points (a) If the true mean is .9550 with a standard deviation of 0.0050, within what interval will 95 percent of the sample means fall? (Round your answers to 4 decimal places.) x Answer is complete but not entirely correct. The interval is from 0.9562 X to 0.9618 X (b) If the true mean is .9550 with a standard deviation of 0.0050, what is the sampling distribution of X ? 1. Exactly normal with / = .9550 and o = 0.0050. 2. Approximately normal with u = .9550 and o = 0.0050. 3. Exactly normal with / = .9550 and of = 0.0050 /V41. 4. Approximately normal with u = .9550 and ox = 0.0050 /V41