Answer:
17.9/18.2 =0.984 to 3 decimal places
Explanation:
The initial mean/average = 18.2 gallons
A standard deviation of 0.8 gallons implies a lower-upper limit of (17.4 - 19) gallons of paint used on new tractors.
New mean/average = 17.9 gallons
It is noticeable that this value 17.9 falls within the lower range of the standard deviation of the initial mean; hence the question
What is the probability that this happened by chance?
17.9 รท 18.2 = 0.9835
Therefore, there is a high probability that this happened by chance. 0.9 is closer to 1 than to 0.