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A recent study estimates that 45% of iPhone users still have their phone within 2 years...

A recent study estimates that 45% of iPhone users still have their phone within 2 years of purchasing it. Suppose you randomly select 30 iPhone users. Let random variable X denote the number of iPhone usees who still have gheir original phone after 2 years.

A) Determine the probability that EXACTLY 11 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
B) Determine the probability that at most 5 iPhone users still have their original phoen after 2 years. Round to 3 decimal places
C) Determine the probability that at least 8 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
D) Determine the probability that between 6 and 9 iPhone users still have their original phone after 2 years. Round to 3 decimal places.
Math   Statistics-And-Probability   
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Answer #1

Here we have p=0.45 which is same for all, n=30 which is constant, events are independent and only two outcomes

So all the properties of binomial are satisfied

So we will use excel formula for binomial distribution

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