Question

The probability of a batch of 200 vaccines containing 0, 1, 2, 3, 4, or 5 ineffective vaccines is given in the following probability distribution.

#16Q1.png

What is the probability that a random batch of 200 vaccines contains at least 2 ineffective vaccines?

a. 0.20

b. 0.35

c. 0.65

d. 0.80

Answer 1

Try to attach this picture #16Q1.png

Answer 2

At least 2 means \(P(X \ge 2)=P(X=2)+P(X=3)+P(X=4)+P(X=5)\)

Answer 3

omg please stop with the anne pic >_<

Answer 4

ya I saw you deleted your reply

Answer 5

ok...so what am I supposed to do?

Answer 6

add up the probabilities ... i.e the y-value on your bar graph for x=2, x=3, x=4, x=5

Answer 7

@kirbykirby I add 0.05+0.1+0.15 etc? and then?

Answer 8

0.15, 0.10, 0.05 and 0.05

Answer 9

I am confused -.-"

Answer 10

Add the probabiltiies for ineffectiveness at x=2, x=3, x=4, x=5

Answer 11

At x=2, the probability s 0.15
at x=3, the probability is 0.10
at x =4, the probability is 0.05

Answer 12

at x=5 the probability is 0.05

Answer 13

got that.

Answer 14

I guess it's 0.35?