All the employees of ABC Company are assigned ID numbers. The ID number consists
ID: 3170504 • Letter: A
Question
All the employees of ABC Company are assigned ID numbers. The ID number consists of the first letter of an employee's last name, followed by four numbers. How many possible different ID numbers are there? How many possible different ID numbers are there? How many possible different ID numbers are there for employees whose last name starts with an "A"? The sales records of a real estate agency show the following sales over the past 200 days: How many sample points are there? Assign probabilities to the sample points and show their values. What is the probability that the agency will not sell any houses in a given day? what is the probability of selling at least 2 houses? What is the probability of selling 1 or 2 houses? What is the probability of selling less than 3 houses?Explanation / Answer
(a)
Some of number of days is 200 so number of sample points is 200.
(b)
(c)
The requried probability is 0.3.
(d)
The requried probability is
P(X <=2) = P(X=0)+P(X=1)+P(X=2)= 0.9
(e)
P(X=1 or 2) = P(X=1)+P(X=2) = 0.6
(f)
P(X < 3) = P(X=0)+P(X=1)+P(X=2)= 0.9
Number of Houses sold, X Number of days, f Probability, P(X=x)=f/200 0 60 0.3 1 80 0.4 2 40 0.2 3 16 0.08 4 4 0.02 Total 200 1