There are 327 official ports of entry in the United States. The Department of Homeland Security selects 15 ports of entry at random to be audited for compliance with screening procedures of incoming travelers through the primary and secondary vehicle and pedestrian lanes. What kind of sample is this? a. Stratified sample b. Systematic sample c. Cluster sample d. Simple random sample

The correct answer is letter "D": Simple random sample.

Explanation:

The simple random sample is a term of statistics describing the most basic fundamental sample from a data population. The simple random sample is intended to represent the entire data population equivalently. Just like in the example, the data population is the 327 official ports of entry in the U.S. then the random selection is the 15 of those ports will represent the entire ports' population.

answer: 11/12

step-by-step explanation: 4 1/4 and 3 1/3 is equivalent to 4 3/12 and 3 4/12. 4 3/12 - 3 4/12 =11/12