View Full Version : Find the probability that at least 11 students volunteered at least occasionally.

Cyprus

11-30-2015, 10:10 PM

A recent survey found that 86% of first-year college students were involved in volunteer work at least occasionally. Suppose a random sample of 14 college students is taken. Find the probability that at least 11 students volunteered at least occasionally.

I honestly dont know where to start. My thought process was to assume there are 100 students, and if it says 86% involved in volunteer work so thats 86 students, and if 14 students are randomly selected, that would be 13/100 now I am getting tripped up on how to incorporate the probability that 11 students volunteers at least occasionally. :(

Subhotosh Khan

12-01-2015, 08:57 AM

A recent survey found that 86% of first-year college students were involved in volunteer work at least occasionally. Suppose a random sample of 14 college students is taken. Find the probability that at least 11 students volunteered at least occasionally.

I honestly dont know where to start. My thought process was to assume there are 100 students, and if it says 86% involved in volunteer work so thats 86 students, and if 14 students are randomly selected, that would be 13/100 now I am getting tripped up on how to incorporate the probability that 11 students volunteers at least occasionally. :(

Why is that?

Ishuda

12-01-2015, 11:46 AM

A recent survey found that 86% of first-year college students were involved in volunteer work at least occasionally. Suppose a random sample of 14 college students is taken. Find the probability that at least 11 students volunteered at least occasionally.

I honestly dont know where to start. My thought process was to assume there are 100 students, and if it says 86% involved in volunteer work so thats 86 students, and if 14 students are randomly selected, that would be 13/100 now I am getting tripped up on how to incorporate the probability that 11 students volunteers at least occasionally. :(

The outcome is a yes/no (2 choices) kind of question [yes=does volunteer, no=does not volunteer or vice-versa]. What does that suggest?

Cyprus

12-01-2015, 07:16 PM

Why is that?

Sorry I meant 14/100

The outcome is a yes/no (2 choices) kind of question [yes=does volunteer, no=does not volunteer or vice-versa]. What does that suggest? Bi....ial!

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