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20% of teenagers in a small town say they like reading news online. Suppose you randomly...

20% of teenagers in a small town say they like reading news online. Suppose you randomly select 7 teenagers from the town and ask them whether or not they enjoy reading news online. Find the probability that at least 3 say they enjoy reading news online.

Math   Statistics-And-Probability   
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Answer #1

Solution: We are given that 20% of teenagers in a small town say they like reading news online.

Let x be the number of teenagers in a small town who like reading news online. Then the random variable x follows the binomial distribution with parameters n = 7 and p = 0.20

We are required to find:

Using the binomial probability formula, we have:

We know that:

Therefore, the probability that at least 3 say they enjoy reading news online is 0.1480

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