Answer:
The best prediction for the population in year 25 is 
Step-by-step explanation:
we have a exponential function of the form

where
a is the initial value
b is the base
In this problem





so

For 
substitute


Round up

Answer:
a) 0.05
b) 0.9826
c) 0.000039308
Step-by-step explanation:
a) 
b) For two minutes, the mean is doubled, hence it is 6. In order to calculate the probability of al least two calls arriving, we calculate first the probability of the complementary event: At most 1 call will arrive. For that probability, we need to sum the probabilities of 0 and 1.


Hence,

c) For five minutes the mean is 15. We need to sum the probabilities of 0, 1 and 2.


As a result,

Practically 0
Answer:
29 years
Step-by-step explanation:
The population of the Chinese people is 1.3 bn, and they grow at a rate of 0.49% per year. To get the number of years it requires to reach 1.5 bn, we use this method
after x years, the population will be
1.3 * 1.0049^x
so you just need to solve
1.3 * 1.0049^x = 1.5
1.0049^x = 1.5/1.3
x log 1.0049 = log(1.5/1.3)
x = log(1.5/1.3)/log(1.0049)
x = 0.062 / 0.002122
x = 29.25 years
Therefore, at the rate of 0.49%, the Chinese population of 1.3bn needs 29 years to clock 1.5 bn