1. Gerald is an event photographer. In his
brochure he advertises that for every
(4 posed pictures he takes of your event he
will take 5 un-posed pictures. The table
displays the possible number of posed
pictures to the number of un-posed pictures.
Number of Posed
Pictures
posed pictures
Number of Un-posed
Pictures
un-posed pictures
20
16
24
30
32
36
40
45
Number of Un-posed Pictures
0
4
8 12 16 20 24 28 32 36 40
Number of Posed Pictures

The information is really hard to follow, you should ask the question with a screenshot of the data table.

a

b

c

Step-by-step explanation:

Considering question 1

From the question we are told that  

   The waiting times for the train are known to follow a uniform distribution

i.e  

Generally the cumulative distribution function for uniform distribution is mathematically represented as

Generally the average time is mathematically represented as

=>    

=>    

Considering question 2

     The waiting times for the train are known to follow a uniform distribution

i.e  

Generally the 20th percentile of the waiting time is mathematically represented as

=>            

=>          

Considering question 3

        The waiting times for the train are known to follow a uniform distribution

i.e  

Generally the probability of waiting more than 16 minutes given a person has waited more than 9 minutes

=>    

=>      

=>