Answer:
The typedef struct is as follows:
typedef struct jumper_t { 
 char name[16]; 
 double tries[N_TRIES]; 
 double best_jump; 
 double deviation; 
} jumper_t;
The declaration of jlist is:
jumper_t jlist[10]; 
Step-by-step explanation:
This defines the typedef structure
typedef struct jumper_t {
The following declares the variables as stated in the question 
 char name[16]; 
 double tries[N_TRIES]; 
 double best_jump; 
 double deviation; 
} 
This ends the typedef definition
jumper_t;
(b) The declaration of array jlist is:
jumper_t jlist[10];