SOLUTION: Jean is visiting her grandparents in Houston for 7 days. She wants to arrange a lunch with friends. If she picks a day at random, there is a 30% chance that all of her friends will
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Question 1087905: Jean is visiting her grandparents in Houston for 7 days. She wants to arrange a lunch with friends. If she picks a day at random, there is a 30% chance that all of her friends will be available to meet for lunch. What is the probability that all her friends are available to meet for lunch on 4 different days?
a. 9.7%
b. 22.7%
c. 2.3% Answer by solver91311(24713) (Show Source):
This is a binomial distribution. You want the probability of exactly 4 successes in 7 trials where the probability of success on any given trial is 30%.
Just do the arithmetic.
John
My calculator said it, I believe it, that settles it
