15. The population of an endangered bird is decreasing at a rate of 0.75% per year. There are currently about 200,000 birds left in the world. How many years from now will the bird population be extinct?

The value is    

Step-by-step explanation:

From the question we are told that

   The mean is  

   The standard deviation is  

Generally  1 hours =  60  minutes

  Generally the probability that the exam will be completed in one hour or less is  

Here

From the z -distribution table the probability of  ( Z> -3  )

=>  

=>