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7.07 Applications of binomial distributions

Interactive practice questions

A standard six-sided die is rolled $5$5 times.

a

What is the probability of rolling exactly $3$3 ones?

Round your answer to four decimal places.

b

What is the probability of rolling less than $3$3 ones?

Round your answer to four decimal places.

c

What is the probability of rolling no more than $3$3 ones?

Round your answer to four decimal places.

Easy
7min

Adam has product tested the name of his new product and has found that $61%$61% of people like it. Assuming his product test results are correct, if he randomly asks $50$50 people if they like the name of his new product, what is the probability that exactly $24$24 people will say they like the name?

Give your answer to four decimal places.

Easy
1min

$72%$72% of the fans attending a particular concert are male. If a security guard decides to randomly check exactly $10$10 fans’ bags for prohibited items, what is the probability that he checks exactly $5$5 females' bags?

Give your answer to four decimal places.

Easy
1min

The founders of a dating app claim that $39%$39% of messages are replied to. Assuming that this is correct, if Aaron sends $30$30 messages to different people, what is the probability that he will get replies to exactly half of his messages?

Give your answer to four decimal places.

Easy
1min
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Outcomes

3.3.15

determine and use the probabilities P(X=x)=columnvector(nx)p^x(1−p)^(n−x) associated with the binomial distribution with parameters n and p; note the mean np and variance np(1−p) of a binomial distribution

3.3.16

use binomial distributions and associated probabilities to solve practical problems

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