Final answer:
The probability of selecting a number greater than 600 from a random selection between 1 and 1000 is 40%, as there are 400 numbers within this range and 1000 possible choices in total.
Step-by-step explanation:
The student asked about the probability of selecting a number greater than 600 when a computer randomly selects a number between 1 and 1000. To answer this, we note that the numbers greater than 600 are 601 through 1000, inclusive. Thus, there are 1000 - 600 = 400 numbers that satisfy this criterion. Since there are 1000 possible numbers to choose from, the probability of selecting one greater than 600 (Event A) is 400/1000, which simplifies to 0.40 or 40%. Therefore, the correct answer is b) Event A has a 40% probability.