Question

Freya counted then number of cars that came to a complete stop at stop sign. of the 25 cars, 13 cars came to a complete stop. if Freya observes the next 75 cars that reach the stop sign, how many cars can she expect to come to a complete stop?

Answer 1

The expected value can be calculated with the formula

`E(x)=x\cdot p(x)`

Where p represents the probability, and x represents the new event.

Basically, we just have to find the probability of the 13 cars

`p(x)=(13)/(25)=0.52`

Then, we multiply by the numbers of cars x = 75.

`E(75)=75\cdot0.52=39`

Hence, the right answer is 39. The expected value is 39.