SOLUTION: [The other time i [ask free tutors] without registering, so.. this q is a repeat, thank you tutors! i am really glad to stumble upon this site! really helps me a lot!] Q: A s

Question 971953: [The other time i [ask free tutors] without registering, so.. this q is a repeat, thank you tutors! i am really glad to stumble upon this site! really helps me a lot!]
Q:
A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 P.M. on weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find:
a. No customers are waiting?
b. Four customers are waiting?
c. Four or fewer are waiting?
d. Four or more are waiting?
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 P.M. on weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find:
Let X = number of customers between 4 and 7 P.M. on weekdays at the Safeway Supermarket in the South Strand area
a. No customers are waiting?
P(X = 0) = =
b. Four customers are waiting?
P(X = 4) = =
c. Four or fewer are waiting?
P(X ≤ 4) = =
d. Four or more are waiting?
P(X ≥ 4) = 1 - P(X ≤ 3)
= =
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