The following represents the probability distribution for the daily demand of computers at a local store. The probability of having a demand for at least two computers is
A) 0.75.
B) 0.35.
C) 0.60.
D) 1.00.

Question

The following represents the probability distribution for the daily demand of computers at a local store.  ​ The probability of having a demand for at least two computers is
A) 0.75. 
B) 0.35. 
C) 0.60. 
D) 1.00.

Quizplus · Accepted Answer

To find the probability of having a demand for at least two computers, we need to add up the probabilities for demand of 2, 3, 4, and 5 computers.
P(demand ≥ 2) = P(demand = 2) + P(demand = 3) + P(demand = 4) + P(demand = 5)
= 0.15 + 0.25 + 0.10 + 0.05
= 0.55
Therefore, the probability of having a demand for at least two computers is 0.55 or 0.60 (rounded to two decimal places). The closest answer choice is C.

The Following Represents the Probability Distribution for the Daily Demand