A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potentail customer making a purchase is 0.10.
a) What is the probability the salesperson will make at least two sales in a day?
Do you use binomial formula for this question, the answer i got is 0.1869, am i correct?
b) What percentage of days will the salesperson not make a sale?
c) What is the expected number of sales per day?
a) Yes, use the binomial formula and calculate 1  P(0)  P(1).
I get 1  0.4305 + 0.3826 = 0.1869
Congratulations
b) That would be P(0). Use the binomial formula again. I get 43.05%
c) The expected numnber of sales is
8* 0.1 = 0.8.
For a shortcut, use this site:
http://www.ciphersbyritter.com/JAVASCRP/BINOMPOI.HTM#Binomial
but for b) it is asking what percentage of days will the salesperson not make a sale, not what is the probability the salesperson will not make a sale in a day. These are two different questions right, or did i just misunderstood the question?
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