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According to CTIA, 25% of all U.S. households are wireless-only households (no landline). In a random...

According to CTIA, 25% of all U.S. households are wireless-only households (no landline). In a random sample of 20 households, what is the probability that

a. Fewer than 3 are wireless-only?

b. At least 12 are wireless-only?

(Hint: Binomial probability function)
Be Very detailed show every step and calculation!

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