Homework Help: Binomial Math

Posted by Bersy on Sunday, January 27, 2013 at 2:48pm.

From experience, the manager of Kramer's Book Mart knows that 40% of the people who are browsing in the store will make a purchase. What is the probability that among ten people who are browsing in the store, at least five will make a purchase? (Round your answer to four decimal places.)

Binomial Math - Reiny, Sunday, January 27, 2013 at 4:15pm
prob of purchase = .4
prob of no purchase = .6

prob of at least 5 from 10 will make purchase

= prob(5will buy) + prob(6 will buy) + ..+ prob(10 will buy)
....
lots of arithmetic, I will do the prob 6 will buy
= C(10,6) (.4)^6 (.6)^4
= ..

What might be a shorter way is to exclude the cases of none, 1, 2 , 3 or 4 will buy

= 1 - (prob(0 will buy + prob(1 will buy ...+prob(4 will buy)

Answer this Question

Related Questions

MATH - From experience, the manager of Kramer's Book Mart knows that 40% of ...
Math - From experience, the manager of Kramer's Book Mart knows that 30% of ...
business law - 1. Newman decided to rent his home at 32nd and Chestnut Streets. ...
Project Management - You’ve been assigned by your boss to hire a project ...
statistics - A business researcher wants to estimate the average number of years...
bisiness management - You work in the Human Resources department of your ...
Probability - The public transport system is aware that one person in twenty ...
Probabilty - The public transport system is aware that one person in twenty does...
math question - About how many books will fit on a shelf that is 40 inches long ...
algebra - I am a manager at a hospital i have 1,176 hours in a week to be ...

For Further Reading

First Name:
School Subject:
Answer: