Answer:
32
Step-by-step explanation:
Here the two samples should be comparable .
The total number of cows in the farm = 200
the total number of cows giving milk = 150
the total number of cows in corral = 20
Suppose total number of cows giving milk in corral = x
The ratio of the total number of cows present to the total number of cows giving milk should be same in farm and corral
so : 200 = 20
------- -------
150 x
now we do cross multiplication :
200 x = 150* 20
200x = 3000
x= 3000/200
x= 15
SO we expect 15 cows in corral should be giving milk .
Answer : 15
Answer is -6(see photo for step by step):
Answer:
a

b

c

Step-by-step explanation:
The number of vehicles available is 
The number of vans is k = 5
The number of cars is n = 13
Generally P(E) is mathematically represented as

=> 
=> 
Generally P(F| E) means the probability that the second vehicle assigned is a van given that the first one selected is a van this mathematically calculated as



Generally
is also mathematically represented as

=> 
=> 
=>