In 3 billion repetitions of an experiment, a random event occurred in 500 million cases. we would expect the probability of this event to be close to:

6
1/6
3/5

The expected probability of an event is close to:

1/6

Step-by-step explanation:

It is given that:

In 3 billion repetitions of an experiment, a random event occurred in 500 million cases.

We know that:

1 billion is equal to 1000 million.

( Since 1 billion=10^9

and 1 million =10^6

Hence 1 billion=10^3 million)

Hence, 3 billion=3000 million.

Hence, the probability of the event is the ratio of how many times it occurred to the number of times an experiment has been performed.

Hence, the probability is calculated as:

Hence, the probability of an vent is:

1/6

the answer is 15% decrease