The number of customers in line at a supermarket express checkout counter is a random variable with the following probability distribution. x 0 1 2 3 4 5 P(x) 0.10 0.25 0.30 0.20 0.10 0.05

Find P(at least 3)

P(at least 3) = 0.35            

Step-by-step explanation:

We are given the following probability distribution in the question:

x:            0      1        2        3         4        5

P(x):   0.10   0.25   0.30   0.20   0.10   0.05

where x is the number of customers in line at a supermarket

Verification for a discrete probability distribution:

Hence, it is a discrete probability distribution.

We have to evaluate P(at least 3).

Thus,

P(at least 3) = 0.35

0.35 is the probability that there are atleast 3 customers in line at a supermarket.