Pan Thai Restaurant offers 5% discount if the customer pays in cash instead of p

Question

Pan Thai Restaurant offers 5% discount if the customer pays in cash instead of paying by a credit card. Past evidence indicates that 30% of all customers pay in cash. During a day period 120 customers buy gasoline at this station.

1. What is the probability that at least 50 customers pay in cash?
2. 
   
3. What is the probability that no more than 15 customers pay in cash?
4. 
   
5. What is the probability that more than 20 and less than 40 customers pay in cash?
6. 
   
7. Using the choices listed below, what type of discrete probability distribution is this an example of and why?
   1. Continuous probability distribution
   2. Poisson probability distribution
   3. Binomial probability distribution
   4. Hyper geometricprobability distribution

Explanation / Answer

binomial probablility distribution. a) 5/12 b) 9/20

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