Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.74. (a) Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 19 specimens from the seam was 4.85. (Round your answers to

The answer is "(4.518, 5.182)"

Step-by-step explanation:

The aveage porosity for a sample of specimens is

Thus, the confidence interval for the true mean is

Therefore, one can state that the true average porosity will lie  between 4.518 and 5.182 with the 95\% confidence.

Step 1: Find how many gallons are in 5300 liters
There is 1400 gallons in 5300 liters.
Step 2: Find how many drums will hold 1400 gallons
1400÷60=23.333
Because there is a little over 23 we have to round up to 24.
Step 3: State your answer
There are 24 drums needed to hold 5300 liters.

Hope this helps(: