Question

The table gives the probability distribution of the number of DVDs sold per day at a music store. What is the probability of 5 or more DVDs being sold on any given day?

number of DVDs sold in a day

0-4

5-9

10-14

15-20

probability

0.1875

?

0.4375

0.125

A.
0.4375

B.
0.2525

C.
0.8125

D.
1.0000

Answer 1

C. 0.8125

Explanation:

The probability to sell 5 or more DVDs in a day is the complement of the probability of selling less than 5 DVDs in a day, since sales <5 DVDs + sales >= 5 DVDs = 100% of the sales.

So, we know what's the probability of selling less than 5 DVDs in a day is... it's 0.1875

So, to find the possibility of selling 5 or more DVDs in a day, we take 100% of the chances (1.0) and we subtract the probability of selling <5 DVDs in a day:

P = 1.0 - 0.1875 = 0.8125

C. 0.8125 is your answer.