Question

a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

Answer 1

You want the probability of 3, 4 or all 5 having part-time jobs.

for 3 = .3*.3*.3*.7*.7 = ?

for 4 = .3*.3*.3*.3*.7 = ?

for 5 = ?

For either-or probabilities, add the individual probabilities.

Answer 2

For5 =3*3*3*3*3*3

Answer 3

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