# Probability

posted by .

40 students live in a dormitory. 5 have swine flu. If 4 students are selected at random, what is the probability that 1 or 2 of the 4 have swine flu?

• Probability -

Probability of 0: (35/40)(34/39)(33/38)(32/37) = 0.5729

Probability of 4: (5/40)*(4/39)*(3/38)*(2/37) = 120/2,193,360 = 0.000055

Probability of 1:
4*(35/40)*(34/39)*(33/38)*(5/37)= 0.3581

Probability of 2:
(4!/(2!*2!))(35/40)*(34/39)*(5/38)*(4*37)= 0.0651

## Similar Questions

1. ### college math - biostatistics

hey... first time user and really lost. wondering if someone can help: Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. …
2. ### Current Events

Which do you feel in your personal opinion is/was more dangerous--the Avian Flu, SARS, or the Swine Flu?

how did the swine flu start
4. ### swine flu

where would i be able to find the current morbidity and mortality rates of the swine flu in the us?
5. ### statistics

Based on data from a statistical abstract, only about 12% of senior citizens (65 years old or older) get the flu each year. However, about 24% of the people under 65 years old get the flu each year. In the general population, there …
6. ### Probability

According to the record of the registrar's office at a state university, 40% of the students are freshman, 25% are sophomore, 20% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion …
7. ### Statistic

According to the CDC, 25 % of college students get the flu every year. (a) If 7 college students are selected at random?
8. ### Statistics

According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore,16% are junior and the rest are senior. Among the freshman, sophomores, juniors and seniors, the portion of …
9. ### stats

Based on data from a statistical abstract, only about 10% of senior citizens (65 years old or older) get the flu each year. However, about 27% of the people under 65 years old get the flu each year. In the general population, there …
10. ### differential equation

i need help understanding this question? can some one tell me what exactly i have to do in it 7. Suppose a student carrying a flu virus returns to an isolated college campus of 1000 students. Determine a differential equation for the

More Similar Questions