Exhibit 5-1
The following represents the probability distribution for the daily demand of computers at a local store.
-Refer to Exhibit 5-1. The probability of having a demand for at least two computers is
A)0.7
B)0.3
C)0.4
D)1.0

Question

Exhibit 5-1
The following represents the probability distribution for the daily demand of computers at a local store. 
-Refer to Exhibit 5-1. The probability of having a demand for at least two computers is
A)0.7 
B)0.3 
C)0.4 
D)1.0

Quizplus · Accepted Answer

To find the probability of having a demand for at least two computers, we need to add the probabilities of having a demand for exactly 2, 3, 4 or 5 computers: 
P(X≥2) = P(X=2) + P(X=3) + P(X=4) + P(X=5) 
P(X≥2) = 0.1 + 0.2 + 0.3 + 0.2 
P(X≥2) = 0.8 
Therefore, the probability of having a demand for at least two computers is 0.8 or 80%, which corresponds to choice A.

Exhibit 5-1 The Following Represents the Probability Distribution for the Daily Demand