Question

when buying a candy bar, there is a 20% chance that it will also include a coupon for a second candy bar. a student wants to determine the probability that, if she buys 7 candy bars, more than 2 will include a coupon.​

Answer 1

these are the answers -

i took the test theses were the answers -

A1 = more than two 1s

A2 = 0.4286

hope this helped !

Answer 2

0.148

Explanation:

Given that

probability that a candy will include a coupon for second candy bar = 0.20

Each candy having a coupon is independent of the other also there ae ony two outcomes.

Hence X no of candies which attract a coupon for second candy is binomial

with n = 7 and p = 0.20

Probability that if she buys 7 candy bars, more than 2 will include a coupon.​

=P(X>2)

=P(x=2)+P(X=3)+P(x=4)+P(x=4)+P(X=5)+P(x=6)+P(x=7)

=0.148