Concerns about climate change and CO2 reduction have initiated the commercial production of biodiesel and petrodiesel. Random samples of 48 blended fuels are tested in a lab to ascertain the bio/total carbon ratio.

(a) If the true mean is .9050 with a standard deviation of 0.0100, within what interval will 90 percent of the sample means fall? (Round your answers to 4 decimal places.)

The interval is from_ to _