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Probability

Anybody who knows this, please help meee :frown:

A sales person knows that’s he has a 40% chance of making a sale to a customer that he talks to.If the salesperson sees 20 customers on a particular day:
a. What is the probability that no sales are made? [Don’t use tables. Show yourcalculations.]
b. What is the probability that exactly 3 sales are made? [Show your calculations. Don’tuse tables.]
c. What is the probability that more than 3 sales are made? [Show your calculations. Don’tuse tables.]
d. What is the probability that fewer than 10 sales are made? [Use tables].
e. What is the mean and variance for the sales?
Reply 1
Avatar for TeeEm
TeeEm
19
Original post by Hannah Ha
Anybody who knows this, please help meee :frown:

A sales person knows that’s he has a 40% chance of making a sale to a customer that he talks to.If the salesperson sees 20 customers on a particular day:
a. What is the probability that no sales are made? [Don’t use tables. Show yourcalculations.]
b. What is the probability that exactly 3 sales are made? [Show your calculations. Don’tuse tables.]
c. What is the probability that more than 3 sales are made? [Show your calculations. Don’tuse tables.]
d. What is the probability that fewer than 10 sales are made? [Use tables].
e. What is the mean and variance for the sales?


this is a binomial distribution
look at your notes or at any standard A level Textbook which covers S1 and S2 for some good examples.
(edited 9 years ago)
Reply 2
Avatar for Hannah Ha
Hannah Ha
OP
Ohmm thank u so much, anw can u give me more advices on this question , a little bit is okay :frown:

Thanks a lotsss


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