In a 40-day period, at least one bear was observed by a camper in a designated camp site on 28 separate days. According to this information, what is the daily frequency of bear sightings (in which at least one bear is observed) ?. A. 143%. B. 70%. C. 28%. D. 40%

At least one bear was sighted on 28 separate days in 40 day period total = 28/40

We're looking for the daily frequency of bear sightings, that's in the whole 40 day period.

Let's say 40 days period = 100%.

Then what's 28 days?

So the solution we're looking for would be (28 days∗100) / 40 days = 70%

The final answer is B. 70%.