Answer:
0.4082
Step-by-step explanation:
Data
mean () = 50,000 miles
standard deviation () = 12,000 miles
expected distance (X) = 34,000 miles
In the figure attached, standard normal distribution table can be seen. Z is computed as follows:
In standard table, the area between 0 and -1.33 is the sem as between 0 and 1.33. So, the proportion of trucks is 0.4082